How to continue when things seem as they are not?

Ecclesiastes 6:1-7 KJV

[1] There is an evil which I have seen under the sun, and it is common among men: [2] A man to whom God hath given riches, wealth, and honour, so that he wanteth nothing for his soul of all that he desireth, yet God giveth him not power to eat thereof, but a stranger eateth it: this is vanity, and it is an evil disease. [3] If a man beget an hundred children, and live many years, so that the days of his years be many, and his soul be not filled with good, and also that he have no burial; I say, that an untimely birth is better than he. [4] For he cometh in with vanity, and departeth in darkness, and his name shall be covered with darkness. [5] Moreover he hath not seen the sun, nor known any thing : this hath more rest than the other. [6] Yea, though he live a thousand years twice told, yet hath he seen no good: do not all go to one place? [7] All the labour of man is for his mouth, and yet the appetite is not filled.