A wise man [is] strong
He can do that sometimes by his wisdom, and which requires strength and courage too, which another cannot do by his strength; see ( Proverbs 21:22 ) ( Ecclesiastes 9:15 Ecclesiastes 9:16 ) . This may be understood of one that is spiritually wise, wise unto salvation, wise for another world, is made to know true wisdom in the hidden part. The Stoic philosophers say much of their wise man; that he is happy, and rich, and mighty, and even a king; all which may be said more truly of a good man; he is strong, not absolutely, but comparatively, in comparison of what he himself was; and wicked men are without strength, and do not seek for any elsewhere; nor do they, nor can they do, that which is spiritually good, and are ignorant of their weakness: but so is not a wise man; he has some spiritual strength; he seeks to Christ for more, and, through Christ strengthening him, does all things; and is sensible of his own weakness, and finds that when he is weak he is strong: one eminently wise is strong, in comparison of less knowing and more feeble saints; some are children in knowledge, weak in faith and in conduct, more easily drawn into sin and temptation than others; and, in comparison of these, some are strong, who are to bear with and support the weak, and restore them. A wise man is strong, not in and of himself; he cannot think a good thought, nor do a good action, nor preserve himself from sin and Satan; but he is strong in Christ, and in the power of his might, and in his grace; and, through spiritual strength communicated to him, his heart is strengthened, and the work of grace in his heart; he is strengthened to exercise grace more strongly, to perform the duties of religion, to bear the cross of Christ, to withstand temptations, and to oppose his own corruptions. It may be rendered, "a wise man [is] in strength" F3; he is in Christ the strong hold, whither, as a prisoner of hope, he has fled and turned into; he is in the strong tower, into which he has run and is safe; he is surrounded with the might and power of God on all sides, by which he is kept; yea, a man of knowledge increaseth strength;
a spiritual man, a man endued with spiritual knowledge, with the knowledge of Christ, and salvation by him; as he has a degree of spiritual strength, he increases therein; he grows stronger and stronger, he goes from strength to strength; the more he knows of Christ, the more strongly he trusts in him and loves him, and the more able he is to resist Satan's temptations; and is a better match for false teachers who deceive the hearts of the simple: spiritual strength is increased by means of the word of God, by the promises of the Gospel, and by the ordinances of it.
F3 (zweb) "in fortitudine", Pagninus, Montanus, Mercerus, Gejerus; "in robore", Michaelis.