The Futility of Insatiable Desire

Ecclesiastes 6:7-9

All the labour of man is for his mouth, but his soul shall not be filled.

What hath the wise man more than the fool? and what the poor man, but to go thither, where there is life?

Better it is to see what thou mayst desire, than to desire that which thou canst not know. But this also is vanity, and presumption of spirit.