From Chapter 2 of The New Being, by Paul Tillich.
"In his letter to the Galatians, St. Paul says Be reconciled to God. Cease to be hostile to Him, for He is never hostile to you. The message of reconciliation is not that God needs to be reconciled. How could He be? Since He is the source and power of reconciliation, who could reconcile Him? Pagans and Jews and Christians—all of us have tried and are trying to reconcile Him by rites and sacraments, by prayers and services, by moral behavior and works of charity. But if we try this, if we try to give something to Him, to show good deeds which may appease Him, we fail. It is never enough; we never can satisfy Him because there is an infinite demand upon us. And since we cannot appease Him, we grow hostile toward Him. Have you ever noticed how much hostility against God dwells in the depths of the good and honest people, in those who excel in works of charity, in piety and religious zeal? This cannot be otherwise; for one is hostile, consciously or unconsciously, toward those by whom one feels rejected. Everybody is in this predicament, whether he calls that which rejects him "God," or "nature," or "destiny," or "social conditions." Everybody carries a hostility toward the existence into which he has been thrown, toward the hidden powers which determine his life and that of the universe, toward that which makes him guilty and that threatens him with destruction because he has become guilty.
We all feel rejected and hostile toward what has rejected us. We all try to appease it and in failing, we become more hostile. This happens often unnoticed by ourselves. But there are two symptoms which we hardly can avoid noticing: The hostility against ourselves and the hostility against others. One speaks so often of pride and arrogance and self-certainty and complacency in people. But this is, in most cases, the superficial level of their being. Below this, in a deeper level, there is self-rejection, disgust, and even hatred of one’s self. Be reconciled to God; that means at the same time, be reconciled to ourselves. But we are not; we try to appease ourselves. We try to make ourselves more acceptable to our own judgment and, when we fail, we grow more hostile toward ourselves. And he who feels rejected by God and who rejects himself feels also rejected by the others. As he grows hostile toward destiny and hostile toward himself, he also grows hostile toward other men. If we are often horrified by the unconscious or conscious hostility people betray toward us or about our own hostility toward people whom we believe we love, let us not forget: They feel rejected by us; we feel rejected by them. They tried hard to make themselves acceptable to us, and they failed. We tried hard to make ourselves acceptable to them, and we failed. And their and our hostility grew. Be reconciled with God—that means, at the same time, be reconciled with the others! But it does not mean try to reconcile the others, as it does not mean try to reconcile yourselves. Try to reconcile God. You will fail. This is the message: A new reality has appeared in which you are reconciled. To enter the New Being we do not need to show anything. We must only be open to be grasped by it, although we have nothing to show."