To be glad of life because it gives you to chance to love and to work and to play and to look up at the stars — to be satisfied with your possessions but not content with yourself until you have made the best of them — to despise nothing in the world except falsehood and meanness, and to fear nothing except cowardice — to be governed by you admirations rather than by your disgusts — to covet nothing that is your neighbors except his kindness of heart and gentleness of manners — to think seldom of your enemies, often of your friends, and every day of Christ; to spend as much time as you can in God’s out-of doors — these are the little guideposts on the foot-path to peace.

Henry Van Dyke (1852-1933) American clergyman and writer

“The Foot-path to Peace,” Tacoma Times (1 Jan 1904)
    (Source)

Often shortened to: "Be glad for life because it gives you the chance to love and to work and to look up at the stars."