In the morning sow your seed, and at evening do not let your hand be idle: For you do not know which of the two will be successful, or whether both alike will turn out well. Poem on Youth and Old Age.
Anything you can turn your hand to, do with what power you have; for there will be no work, no planning, no knowledge, no wisdom in Sheol where you are going. The Time of Misfortune Is Not Known.