The great secret of true success, of true happiness, is this: the man or woman who asks for no return, the perfectly unselfish person, is the most successful.
Hinduism threw away Buddhism after taking its sap. The attempt of all the Southern Acharyas was to effect a reconciliation between the two. Shankaracharya's teaching shows the influence of Buddhism. His disciples perverted his teaching and carried it to such an extreme point that some of the later reformers were right in calling the Acharya's followers "crypto-buddhists".
All power is within you; you can do anything and everything. Believe in that, do not believe that you are weak; do not believe that you are half-crazy lunatics, as most of us do nowadays. You can do anything and everything without even the guidance of any one.
This is the secret of spiritual life: to think that I am the Atman and not the body, and that the whole of this universe with all its relations, with all its good and all its evil, is but as a series of paintings...scenes on a canvas...of which I am the witness.