Ecclesiastes 11:6-9

In the morning, sow your seed, and in the evening, do not let your hand cease. For you do not know which of these may rise up, the one or the other. But if both rise up together, so much the better. Light is pleasant, and it is delightful for the eyes to see the sun. If a man lives for many years, and if he has rejoiced in all of these, he must remember the many days of the dark times, which, when they will have arrived, will accuse the past of vanity. So then, rejoice, O young man, in your youth, and let your heart remain in what is good during the days of your youth. And walk in the ways of your heart, and with the perception of your eyes. And know that, concerning all these things, God will bring you to judgment.