Einstein was one of the first physicists to actively talk about the merging of religion and physics; his spiritual beliefs were most unusual for his time, and foreshadowed modern spiritual thinking.
Einstein Quotes @ Life & Religion:
Whoever undertakes to set himself up as a judge of Truth and Knowledge is shipwrecked by the laughter of the gods.
All religions, arts and sciences are branches of the same tree.
God does not care about our mathematical difficulties. He integrates empirically.
God may be subtle, but he isn't plain mean.
I cannot imagine a God who rewards and punishes the objects of his creation and is but a reflection of human frailty.
Morality is of the highest importance - but for us, not for God.
Science without religion is lame. Religion without science is blind.
True religion is real living; living with all one's soul, with all one's goodness and righteousness.