Kurma  Bhagavan described to Maharshis that after the Sanatana Srishti by Paramatma,  Brahma took up the task of Srishti of ‘Charaachara Jagat’and created nine  Maanasa Putras or Mind-borne Sons viz. Marichi, Bhrigu, Angira, Pulastya,  Pulah, Kratu, Daksha, Atri, and Vasishtha. The Four Vedas of Ruk-Yajur-Saama  and Atharva constituted the natural appearance of Brahma. At the beginning of  Srishti, Trigunas of Satwa-Rajasa and Tamasika were non-existent; there was no  Raaga-Dweshas or Desire-Hatred Syndrome and no interplay of ‘Arishadvargas’or  the Six Basic Enemies of Beings viz. Kama (desire), Krodha (anger), Lobha (greed),  Moha (infatuation), Mada (arrogance) and Matsara (jealousy). With the passage  of time the concepts of ‘Swadharma’and ‘Paradharma’accentuated the  class-distinction and Brahmana Dharma was defined as : 
    Yajanam Yaajanam Daanam  Brahmanasya pratigraham, 
    Ahyaapanam cha adhyayanam Shasta  Karmaani Dwijotthama/ 
  (The  six major duties of Brahmanas were stated to be the Performance of Yajnaas,  enabling and encouraging the Yajna Karmas, giving as also receiving ‘Daanaas’;  Adhyayana or Reciting Scriptures and Adhyaapana or Teaching them). Daana,  Adhyayana and Yajna are the common features of Kshatriyas and Vaishyas while  Kshatriyas have the duties of Law-Order -Defence as Vaishyas perform Business,  Agriculture, Trading and Accounting. The other categories are to specialise in  Shilpa, Crafts and such other professions.
   As regards Ashrama Dharmaas viz. Garhastya-Vanaprastya-Sanyasa and  Brahmacharya, Kurma Bhagavan ordained the   following: 
  Agnayotithishurushaa Yajno Daanam  Suraarchanam, 
  Gruhastasya Samaasena Dharmoyam  Munipungavaah/ 
  Homo Mula phalaashitwam  Swaadhyaastapa eva cha, 
  Samvibhaago yathaanyaayam  Dharmoyam Vanavaasinam/ 
  Bhaiksaashanam cha Mounitwam Tapo  dhyaanamviseshatah, 
  Samyajnaanam cha vairaagyam  Dharmoyam Bhikshukey matah/ 
  Bhikshaachaaryaacha shusrushaa  Guroh Swaadhyaaya eva cha, 
  Sandhyaa karmaagni Kaaryaacha  Dharmoyam Brahmachaarinam/ 
  (Grihastya  Dharma mainly entails Upasana of Agnis viz. Garhapatya, Aahavaniya,  Dakshinaagni; Atithi Seva; Yagna-Daana- Deva Pujas form  the core of Brahmana Vidhi. Havana, Kanda  mula phala sevana, Swaadhyaaya and Tapas are the Vaana Prastha Dharmaas;  Bhiksha bhojana, Mouna Vrata, Tapa, Samyakm Dhyaana or Composite worship of  Deities, Samyak Jnaana and Vairagya or other worldliness are Sanyasa Dharrmas.  Brahmachaari Dharmas include Bhiksha Bhojana, Guru Seva, Swaadhyaaya, Sandhyaa  karma and Agni Karyas. While annotating Grihasta Dharma, Kurma Bhagavan  clarified that sleeping with one’s own wife-sujbect to specified qualifications  was to be concerned as  Brahmacharya itself  : 
  Rithu kaalaa –bhigaamitwam  Swadaareshu na chaanyatah, 
  Parvarjyam Grihastasya  Brahmacharyamudaa hritam/ 
  Also,  Kurma Deva proclaimed: 
  Vedaabhyaasonvaham Shaktyaa  Shraaddham chaatithi pujanam, 
  Grihastasya Paro Dharma  Devataabhyarchanam tathaa/
  Trayaanaamaashramaanaam tu  Grihastho yoniruchtatey, 
  Anyey tamupajeevanti  tasmaancchreyaan Grihaashrami/ 
  (Grihasta  Ashrama is considered the seed of the Four   Ashramas and the most significant); more so, the ‘Purusharthaas’ of  human beings are Dharma-Artha-Kaama-Mokshaas and hence the importance of this  Ashrama.) But the common requirements of all the Ashrams are:
  Kashamaa Damo Dayaa  Daanamalobhastyaaga Eva cha, 
  Aarjivam  chaanasuya cha Tirthaanusaranam tathaa/ 
  Satyam Santosha Aastikyam  Shraddhaa chendriya nigrahah, 
  Devataabhyarchanam Pujaa  Brahmanaanaam Viseshitah/ 
  Ahimsaa priyavaa ditwamapaishunyamakaltataa, 
  Samaasikamimam Dharmam  Chaturvarnerbraveen Manuh/   
  (Kshama  or patience, Daya or compassion, Daada or charity, Alobha  or non-greediness, Tyaga or sacrifice, Arjiva  /softness of speech and behaviour, Anasuya or lack jealousy / large  heartednesss; Tirtha Sevana, Satya or Truthfulness, Santosha  or Happiness / contentment; Aastikata  or Attachment to Vedas and Scriptures;  Shraddha or devotion; Jitendriatwa or overcoming of Physical attractions; Deva  Puja, Brahmana Puja, Ahimsa / Non-Violence, Madhura Bhashana or nice manner of  conversation and Paapa Rahitya or general attitude of sinlessness). In fact the  First Manu named Swayambhu Manu prescribed the above noble traits/ common  features of all the Human Beings irrsepective of the Chaturvarnaas. Among  Brahmacharis, there again are  of two  categories viz. Upakurvaan and Naishthika  Brahma tatpara; Brahmacharis learn   and  recite Vedas and then enter  into Grihastaashrama are called Upakuyravaans while those who always remained  with Guru are  called Naishtika  Brahmacharis.  Again Grihastis are of two  kinds viz. Udaaseenas and Saadhakaas; the former Grihastis lead a virtuous life  and simultaneously take up  family  responsibilities too are Sadhakas; while those who leave away the Pitruruna,  Devaruna, Rishiruna besides leave family, money and social obligations and  remain targetted only at Moksha  are  Udaseenas. Likewise, Sanyasis are of three categories: Jnaana Sanyasis or  those  Veda Sanyasis or Bhoutika  Sanyasis; Bhoutika Sanyasis in which Bhavana is important, while Veda Sanyasis  are of Sankhya or Yoga practitioners;   and Karma Sanyasis or the   performer of the prescribed karmas or deeds.
  Singularity of Tri Murthis:  Depending on the emphasis of the  Satwa-Rajas-Tamasa Gunas of the Eternal and Unique Paramatma, three Murtis were  formed as Brahma-Vishnu and Maheshwara: 
  Tistrastu Murtayah prokta Brahma  Vishnu Maheswaraah, 
  Rajah Satwa Tamoyogaat Parasya  Paramatmanah/ 
  Anyonyayamanuraktaastey  hyanonyamupa jeevinah, 
  Anyonyam pranataashchaiva  leelayaa Parameshvaraah/ 
  Braahmi Maaheshwari chaiva  tathaivaakshara bhavanaa, 
  Tristrastu Bhavana Rudrey  vartantey satatam Dwijaah/ 
  Pravartatey mayyajastramaadyaa  chaakshara bhaavanaa, 
  Dwitiya Brahmanah proktraa  Devasyaakshara bhaavanaa/  
  Aham chaiva Maha Devo na bhinnou  paramaarthatah, 
  Vibhajya swecchhayaatmaanam  sontaraameshwarah sthitah/
  Ttrailokya makhilam Srushtim  Sadevaasura maanushaam, 
  Purushaha Paratovyaktaad Brahmatwam  samupamagat/ 
  Tasmaad Brahmaa Mahadevo  Vishnurvishweshvarah Parah, 
  Ekaikssyaiva  Smritaastitrastanuh Karyavashaat Prabho/ 
  Tasmaat sarva prayatnena Vandyaah  Pujyaah prayatnatah, 
  Yadicchedachiraat sthaanam  yattanmokshaakhya mavyayam/   
  (Paramatma  materialised Trimurtis on the basis of Satwa-Rajo-Tamo Gunas for the three  basic responsibilities of Srishti-Sthiti-Samhara; the Three Profiles are  dependent on each other, transferable to each other, interested and involved  with each other in fulfilling their tasks;  they also greet each other, exchange and also supplement each other’s  thoughts and deeds. Indeed they are  indivisible. Also, Rudra is interactive with the inherent thoughts of Brahmi,  Maheswari and Akshara / Vaishnavi. From his side said Bhagavan Vishnu / Kurma  Deva that the thoughts of ‘A’kshara were spontaneous and of the second Letter  of the word Akshara denoted Brahmi and so on. As far as Vishnu and Maheshwara  were concerned there indeed was no duplication whatsoever.  They were mutually and freely exchangeable,  divisible yet wholly singular, mystifying and confusing and were indeed one and  the same. It was the same Swarupa of Bhagavan who was like all the three who  were close-knit! Indeed all three Murtis are worthy of worship and thus the  need for attaining any one of them is similar to realise them all.