The non-commutativity of the underlying process produces an ontological complementarity. This must be contrasted to Bohr's epistemological complementarity.
Men are never duly touched and impressed with a conviction of their insignificance, until they have contrasted themselves with the majesty of God
I wish to speak a word for Nature, for absolute Freedom and Wildness, as contrasted with a Freedom and Culture merely civil, - to regard man as an inhabitant, or a part and parcel of Nature, rather than a member of society.
A Curve does not exist in its full power until contrasted with a straight line.
Discontent arises from a knowledge of the possible, as contrasted with the actual.
Joy is at its keenest when contrasted with sorrow, courage at its height when it follows fear, faith at its noblest when it grows from doubt.