Charles H. Spurgeon on Psalms 126:6

Precious seed. Faith is called "precious seed": quod tatum est charurn est. Seed was accounted precious when all countries came unto Egypt to buy corn of Joseph, and truly faith must needs be precious, seeing that when Christ comes he shall hardly "find faith upon the earth": Lu 18:8. The necessity of faith is such, that therefore it must need be precious; for as the material seed is the only instrumental means to preserve the life of man; for all the spices, honey, myrrh, nuts, and almonds, gold and silver, that were in Canaan, were not sufficient for Jacob and his children's sustenance; but they were forced to repair unto Egypt for corn, that they might live and not die; even so, without faith the soul is starved; it is the food of it; for, "the just man liveth by his faith": Ga 3:11. —John Hume.