'Going' in the Bible

For who [limited by human wisdom] knows what is good for man during his lifetime, during the few days of his futile life? He spends them like a shadow [staying busy, but achieving nothing of lasting value]. For who can tell a man what will happen after him [to his work, his treasure, his plans] under the sun [after his life is over]?

Whatever your hand finds to do, do it with all your might; for there is no activity or planning or knowledge or wisdom in Sheol (the nether world, the place of the dead) where you are going.

But beyond this my son, [about going further than the words given by one Shepherd], be warned: the writing of many books is endless [so do not believe everything you read], and excessive study and devotion to books is wearying to the body.