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.
ONCE remove the old arena of theological quarrels, and you will throw open the whole world to the most horrible, the most hopeless, the most endless, the most truly interminable quarrels; the untheological quarrels.