If the Gayatri has not been chanted for three generations in the family of a Brahmin, its members lose caste (they cease to be Brahmins). The quarter where such Brahmins live cannot be called an "agrahara". It is perhaps not yet three generations since Brahmins gave up the Gayatri. So they still may be called Brahmins.
In the same way if the Brahmin family has not performed sacrifices for three generations its members will be called "Durbrahmanas", degenerate Brahmins. Even though degenerate the label "Brahmin" sticks to them. There are prayascittas (expiatory rites) by means of which the corrupted Brahmins will be remade true Brahmins. But there is no such hope for a Brahmin in whose family Gayatri has not been chanted for three generations. A member of such a family ceases altogether to be a Brahmin and cannot be made one again. He is just a "Brahmana- bandhu", a kin or a friend of Brahmins. The same rule applies to Ksatriyas and Vaisyas with regard to the Gayatri mantra; they become "ksatriya-bandhus" and "Vaisya-bandhus" respectively.
The spark I mentioned earlier must be built into a fire. The spark by itself does not serve any purpose. But it has in it the potential to grow into a bright flame or a radiant fire.
At least on Sundays, all those who wear the sacred thread must do Gayatri japa a thousand times. They must not eat unclean food, goto unclean places and must atone for lapses in ritual observances and in maintaining ritual purity. Henceforth they must take every care to see that their body is kept chaste and fit for it to absorb mantric power.
Even in times of misfortune the Gayatri must be muttered at least ten times at dawn, midday and dusk. These are hours of tranquility. At dawn all creatures including human beings rise and the mind is serene now. At dusk all must be restful after a day's hard work: that is also a time of calm. At noon the sun is at its height and people are at home and relaxed and their mind is calm. During these hours we must meditate on Gayatri, Savitri and Sarasvati. In the morning the dominant presence is that of Visnu, at noon that of Brahma and at sundown of Siva. So we must meditate on Gayatri in the morning as Visnu personified, at noon as Brahma personified and at dusk as Siva personified.
Gayatri contains in itself the spirit and energy of all Vedic mantras. Indeed it imparts power to other mantras. Without Gayatri-japa, the chanting of all other mantras would be futile. We find hypnotism useful in many ways and we talk of "hypnotic power". Gayatri is the hypnotic means of liberating ourselves from worldly existence as well as of controlling desire and realising the goal of birth. We must keep blowing on the spark that is the Gayatri and must take up the Gayatri-japa as vrata. The spark will not be extinguished if we do not take to unsastric ways of life and if we do not make our body unchaste.
Gayatri-japa and "arghya" (offering libation) are the most important rites of sandhyavandana. The other parts of this rites are "angas" (limbs). The least a sick or weak person must do us to offer arghya and mutter the Gayatri ten times. "Oh only these two are important aren't they? So that's all we do, offer arghya and mutter the Gayatri ten times a day. " If this be our attitude in due course we are likely to give up even these that are vital to sandhyavandyana. A learned man remarked in jest about the people who perform arghya and mutter Gayatri only ten times thus applying to themselves the rule meant for the weak and the unfortunate: "They will always remain weak and be victims of some calamity or other". Sandhyavandana must be performed properly during right hours. During the Mahabharata war, when water was not readily available, the warriors give arghya at the right time with dust as substitute.
Arghya must be offered before sunrise at noon and at sunset. Once there was a man called Idaikattu Siddha who grazed cattle. He said: "Kanamar konamar kandu kodu adugan pohutu par. " "Kanamal/r" means before you see the sun rise and "konamal/r" means when the sun is overhead and "kandu" is when you see the sun before sunset. These are the three times when you ought to offer arghya. "adu" means "niradu", bathe in the Ganga. "kan" here means "visit Setu" or have " have darsana of Setu". "Pohutu par"- by bathing in the Ganga and by visiting Setu your sins will be washed away. Here is mentioned the custom of going to Kasi, collecting Ganga water there and going to (Setu) Ramesvaram to perform the abhiseka of Ramanathasvamin there.
Only by the intense repetition of Gayatri shall we be able to master all the Vedic mantras. This japa of Gayatri and arghya must be performed everyday without fail. At least once in our lifetime we must bathe in Ganga and go on pilgrimage to Setu.
If a man has a high fever, people looking after him must pour into his mouth the water with which sandhyavandana has been performed. Today it seems all of us are suffering all the time from high fever! When you run a high temperature you have to take medicine; similarly Gayatri is essential to the self and its japa must not be given up at any time. It is more essential to your inner being than medicine is to your body. Sandyavandana must be performed without fail everyday. Gayatri-japa can be practised by all of us without much effort and without spending any money. All that you require is water. Sandyavandana is indeed an easy means to ensure your well being. So long as there is life in you, you must perform it.
Gayatri must be worshiped as a mother. The Lord appers in many forms to bestow his grace and compassion on his devotees Mother loves us more than anybody else. We know no fear before her and talk to her freely. Of all the forms in which Bhagavan manifests himself that form in which he is revealed as mother is most liked by us. The Vedas proclaim Gayatri to be such a mother.
This mantra is to be repeated only by men. Women benefit from the men performing the japa. Similarly when the three varnas practise gayatri-japa all other jatis enjoy the benefit flowing from it. We may cease to perform a rite if the fruits yielded by them are enjoyed exclusively by us. But we cannot do so if others also share in them. Those entitled to Gayatri mantra are to regard themselves as trustees who have to mutter it on behalf of others like women and the fourth varna who are not entitled to it. If they fail in their duty of trustees, it means they are committing an irremediable offence.
The mantras are numerous. Before we start chanting any of them, we say why we are doing so, mention the "fruit" that will yield. The benefit we derive from the Gayatri mantra is the cleansing of the mind (cittasuddhi). Even other mantras have this ultimate purpose, but cittasuuddhi is the direct result of Gayatri-japa.
Even in these days it is not difficult to perform sandhyavandana both at dawn and dusk. Office goers and other workers may not be at home during midday. They may perform the madhyahnika (the midday vandana) 2 hours 24 minutes after sunrise that is called "sangava kala".
We must never miss the daily sandhyavadana unless we find it absolutely impossible to perform. When we fall ill, in our helplessness we ask others for water or kanji in the same way, we must ask our relative or friend to perform sandhyavandana on our behalf.
Let us all pray to God that he will have mercy upon us so that the fire of mantras is never extinguished in us and that it will keep burning brighter and brighter.
For a general background, please see here