Exultation-Lamentation

He who binds to himself a joy does the winged life destroy; but he who kisses the joy as it flies lives in eternity's sun rise. (William Blake)

Through loyalty to the past, our mind refuses to realize that tomorrow's joy is possible only if today's makes way for it; that each wave owes the beauty of its line only to the withdrawal of the preceding one. (André Gide)

Grief should be the instructor of the wise; sorrow is Knowledge. (Byron)

Ay, in the very temple of Delight, Veiled Melancholy has her sovran shrine. (John Keats)