Surrender happens through love, trust, egolessness; surrender means surrendering the ego. Obedience is a cultivation of the ego, of pruning the ego here and there, of bringing it into a certain shape, into a certain form so that it can co-exist with the society, so that it can coexist with the already established order of things. Obedience is in the service of the past, surrender is not in the service of anybody else.
Surrender is simply becoming free of your ego. And the moment you are free of the ego, your life starts growing wings. Ego is heavy; it is like a rock hanging around your neck. It goes on keeping you tethered to the earth, it gravitates towards the earth. Once the ego is dropped, suddenly you start rising upwards: your life becomes a tremendous upward movement, you are uplifted. Surrender makes you weightless; it allows you to go against gravitation. Another law of life starts functioning: the law of grace.
-Osho, "Walking in Zen, Sitting in Zen, #11, Q3”