Ecclesiastes 10:10

10:10 If an iron axhead is blunt and a workman does not sharpen its edge,

he must exert a great deal of effort;

so wisdom has the advantage of giving success.

Ecclesiastes 11:6

11:6 Sow your seed in the morning,

and do not stop working until the evening;

for you do not know which activity will succeed –

whether this one or that one, or whether both will prosper equally.