Jamieson, Fausset and Brown on Galatians 6:7

7. God is not mocked--The Greek verb is, literally, to sneer with the nostrils drawn up in contempt. God does not suffer Himself to be imposed on by empty words: He will judge according to works, which are seeds sown for eternity of either joy or woe. Excuses for illiberality in God's cause (Ga 6:6) seem valid before men, but are not so before God (Psa 50:21).

soweth--especially of his resources (2Co 9:6).

that--Greek, "this"; this and nothing else.

reap--at the harvest, the end of the world (Mt 13:39).