Exodus 4:18

18.And Moses went. It is surprising that Moses should have suppressed the vision whereby the mind of his father-in-law might have been most inclined to let him go; for he speaks merely of human feelings, that he desired to revisit his brethren and relations. Yet it must have been disagreeable to his father-in-law to lose his services, and that diligence and industry by which he had largely profited; nor could it have been pleasant to send away his daughter and grandchildren to a foreign country. Whether he was forbidden to do so by God, or whether he was silent from fear and shame, is uncertain; but I incline rather to this supposition, that he dared not speak of his vocation, lest its incredibility should cause him to be suspected of falsehood and vanity. Since, then, it would have been difficult to obtain belief as to his vocation, he preferred making a pretext of his natural affection. But Jethro being persuaded more by divine inspiration than by that excuse, was easily prevailed on; although I make no doubt that for forty years Moses had been giving such proofs of his honesty, that he was exempted from every evil suspicion. We know how much respect is gained by long experience; since, then, Moses had so long manifested his integrity, his father-in-law could have no fears of his levity, or fraud, or deceit. By this example believers learn ever to seek to obtain a good reputation; for there is nothing which so greatly facilitates the transaction of all affairs as the constant course of an upright and innocent life. For, from whence arises so much difficulty in obtaining what each may want from his neighbor? Whence such hinderances, such reproaches on one side and the other, but because, while every one would be believed, no one labors to obtain credit by his integrity? But although Moses had conciliated his father-in-law by his upright and holy life, still he was confirmed in his vocation by the readiness with which his demand was complied with, for the permission was full of courtesy and kindness without any sign of unwillingness or regret.