All About Bharatiya Sanatana Dharmam otherwise known as Hinduism : Ch-3.15-3.

15. The Law of Spiritual Economics-3.
( Very important section, understand well pse )

3. Character Determines Caste :

A Brahmana is no Brahmana if he is not endowed with purity and good character, and if he leads a life of dissipation and immorality.

A Sudra is a Brahmana if he leads a virtuous and pious life.

What a great soul was Vidura!

What a noble, candid, straightforward student was Satyakama Jabala of Chhandogya Upanishad!

Caste is a question of character.

Varna is no more the colour of the skin, but the colour of one’s character or quality.

Conduct and character count and not lineage alone.

If one is Brahmana by birth and, at the same time, if he possesses the virtues of a Brahmana, it is extremely good, because certain virtuous qualifications only determine the birth of a Brahmana.

Swami Sivananda
      To be continued...