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

2 Give a portion to seven, yea, even unto eight; for thou knowest not what evil shall be upon the earth.

5 As thou knowest not what is the way of the wind, [nor] how the bones [do grow] in the womb of her that is with child; even so thou knowest not the work of God who doeth all.

6 In the morning sow thy seed, and in the evening withhold not thy hand; for thou knowest not which shall prosper, whether this or that, or whether they both shall be alike good.

8 Yea, if a man live many years, let him rejoice in them all; but let him remember the days of darkness, for they shall be many. All that cometh is vanity.

9 Rejoice, O young man, in thy youth, and let thy heart cheer thee in the days of thy youth, and walk in the ways of thy heart, and in the sight of thine eyes; but know thou, that for all these things God will bring thee into judgment.