When we sow something, we do it in expectation of growth in that which we have sown. It is this growth that we reap. The process of growing and harvesting crops is one with which readers of scripture both past and present would be familiar. We know that when we sow certain crops, we reap a useful harvest: a yield of grain heads to create meal, for instance, which can provide food for the community.
Sow the wind and reap whirlwind
Other Proverbs
A fleeing enemy, silver bridge ( A enemigo que huye puente de plata)
Who grasps at too much loses everything
Appetite comes with eating
“Be more apañao’ that a peseta”