4:10 O my Lord, I am not eloquent - He was a great philosopher, statesman, and divine, and yet no orator; a man of a clear head, great thought and solid judgment, but had not a voluble tongue, nor ready utterance; and therefore he thought himself unfit to speak before great men, and about great affairs. Moses was mighty in word, Acts 7:22, and yet not eloquent: what he said was strong and nervous, and to the purpose, and distilled as the dew, Deu 32:2, though he did not deliver himself with that readiness, ease and fineness that some do.
4:10-17 Moses continued backward to the work God designed him for; there was much of cowardice, slothfulness, and unbelief in him. We must not judge of men by the readiness of their discourse. A great deal of wisdom and true worth may be with a slow tongue. God sometimes makes choice of those as his messengers, who have the least of the advantages of art or nature, that his grace in them may appear the more glorious. Christ's disciples were no orators, till the Holy Spirit made them such. God condescends to answer the excuse of Moses. Even self-diffidence, when it hinders us from duty, or clogs us in duty, is very displeasing to the Lord. But while we blame Moses for shrinking from this dangerous service, let us ask our own hearts if we are not neglecting duties more easy, and less perilous. The tongue of Aaron, with the head and heart of Moses, would make one completely fit for this errand. God promises, I will be with thy mouth, and with his mouth. Even Aaron, who could speak well, yet could not speak to purpose, unless God gave constant teaching and help; for without the constant aid of Divine grace, the best gifts will fail.
