Thomas à Kempis
Love flies, runs, leaps for joy; it is free and unrestrained. Love gives all for all, resting in One who is highest above all things, from whom every good flows and proceeds. Love does not regard the gifts, but turns to the Giver of all good gifts. Love knows no limits, but ardently transcends all bounds. Love feels no burden, takes no account of toil, attempts things beyond its strength; love sees nothing as impossible, for it feels able to achieve all things. Love therefore does great things; it is strange and effective; while he (or she) who lacks love faints and fails.
Source: The Inner Life