Nature first, then theory. Or, better, Nature and theory closely intertwined while you throw all your intellectual capital at the subject. Love the organisms for themselves first, then strain for general explanations, and, with good fortune, discoveries will follow. If they don't, the love and the pleasure will have been enough.
E. O. WilsonThe search for knowledge is in our genes. It was put there by our distant ancestors who spread across the world, and it's never going to be quenched.
E. O. Wilson