Peace is that state in which fear of any kind is unknown. But Joy is a positive thing; in Joy... something goes out from oneself to the universe, a warm, possessive effluence of love. There may be Peace without Joy, and Joy without Peace, but the two combined make happiness.
As we age, the mystery of Time more and more dominates the mind. We live less in the present, which no longer has the solidity that it had in youth; less in the future, for the future every day narrows its span. The abiding things lie in the past.