Ecclesiastes 11:2; Ecclesiastes 11:5-6; Ecclesiastes 11:8-9

2 Give a portion to seven, and also to eight: for thou knowest not what evil shall be upon the earth.

5 As thou knowest not what is the way of the spirit, nor how the bones are joined together in the womb of her that is with child: so thou knowest not the works of God, who is the maker of all.

6 In the morning sow thy seed, and in the evening let not thy hand cease: for thou knowest not which may rather spring up, this or that: and if both together, it shall be the better.

8 If a man live many years, and have rejoiced in them all, he must remember the darksome time, and the many days: which when they shall come, the things past shall be accused of vanity.

9 Rejoice therefore, O young man, in thy youth, and let thy heart be in that which is good in the days of thy youth, and walk in the ways of thy heart, and in the sight of thy eyes: and know that for all these God will bring thee into judgment.