Without examining the literal statement, for the meaning of that is plain, we had better approach the inner sense contained in it, and examine that, in which the second and third blessings mentioned are capable of an enlarged and ample extension. As, for instance, good health, and a vigorous state of the outward senses, and beauty, and strength, and opulence, and nobleness of birth, and friends, and the power of a prince, and numbers of other things.
And on this account he said, "God shall enlarge," etc. Because taken separately, the abundant possession of such numerous and great blessings has of itself been injurious to many persons who have scarcely dwelt with justice, or wisdom, or any other virtues, the complete possession of which dispenses to man in an admirable manner the advantages which are external to and which surround the body; but the deprivation or absence of them leaves him without the enjoyment or use of them; and man, if deprived of all good protectors, and of the use of these enjoyments, is exposed to as much suffering as he is capable of.
Therefore he prays on behalf of he man who has those things which are around and exterior to the body, that he may dwell in the house of the wise man; so that attending to the rules of all good men he may see and regulate his own course by their example.