Men reward because of appearance. That is, the more visible or pious or charitable our acts, the more rewards men give (Matthew 6:2, 5, 16). However, these outward-only acts get “no reward from your Father in Heaven” (6:1).
God rewards what’s done for His eyes only, and for His glory only. He rewards abundantly, even when no one else seems to notice (6:4, 6, 18).
So Jesus advises us to not seek the rewards or treasures of men, because they are fickle and liable to loss. God’s rewards, however, are eternally secure and of infinite value (6:19-21). When my focus is on loving God and serving others, rewards in Heaven are the result (6:25-34).
I cannot live for the applause of men and the applause of God (6:24). So I choose only the applause from nail-scarred Hands!