The sign of childishness is to say: “Me wants, me-me”; the sign of youth is to say: “I”—and “I”—and “I”; the sign of maturity and the introduction to the eternal is the will to understand that this “I” signifies nothing if it does not become the “thou” to whom eternity unceasingly speaks, and says: “Thou shalt, thou shalt, thou shalt.” The youth wishes to be the only “I” in the whole world; maturity consists in understanding this “thou” for itself, even if it is not said to any other man. Thou shalt, thou shalt love thy neighbor. — Kierkegaard