What do you want to do sadhana for? The aim should not be the satisfaction of egoism: "I want to be a great yogi; I shall have so much power and with that power I shall establish myself in the world." All such thoughts must be thrown far away.
Whenever, in any century, whether in a single heart or in a company of believers, there has been a fresh effusion of the Spirit, there has followed inevitably a fresh endeavor in the work of evangelizing the world.
When you get free from certain fixed concepts of the way the world is, you find it is far more subtle, and far more miraculous, than you thought it was.