Ecclesiastes 2:19
19 and who knows whether he will be wise or a fool? Yet he will be master of all for which I toiled and used my wisdom under the sun. This also is vanity.
Ecclesiastes 8:7
7 For he does not know what is to be, for hwho can tell him how it will be?
Ecclesiastes 9:12
12 For man does not know his time. Like fish that are taken in an evil net, and like birds that are caught in a snare, so the children of man are snared at an evil time, when it suddenly falls upon them.
Ecclesiastes 11:2
2 Give a portion to seven, or even to eight,
for you pknow not what disaster may happen on earth.
Ecclesiastes 11:6
6 In the morning sow your seed, and at evening withhold not your hand, for you do not know which will prosper, this or that, or whether both alike will be good.
