All the different branches of Indian philosophy are indebted to the Samkhya system for its in-depth analysis. This is the authoritative text on Samkhya. Sanskrit Text, word by word meaning, and commentary.
There is only one sin -- and that sin is weakness. When I was a boy, I read Milton's Paradise Lost. The only good man I had any respect for was Satan. The only saint is the soul who never weakens, faces everything, and determines to die game.
-Swami Vivekananda