True self-interest
It is the duty of the Christian to bear his brother's burden, and the duty of every man to love his neighbour as himself; it is also the privilege of the saint to lose his life for Christ's sake, and to "spend and be spent" in the service of man. But there still remains a right and lawful, and even an obligatory, regard to self-interest. For one thing, if a man's own heart and life are wrong, his work in the world must be wrong also.
I. HE IS NOT TRULY WISE WHOSE OWN SOUL IS NOT SAFE.
1. He may know the truth. The wisdom that can unravel many mysteries is his. He has searched into the deep truths of revelation. A diligent reader of the Bible, he is well acquainted at least with the words that God teaches. But he has never regarded the practical bearing of all this truth. It has been to him but a shadow. Then his own soul may be wrecked, though the way to The haven is clear.
2. He may enlighten others. Perhaps he is a preacher of the gospel, and is able to hold up the torch to many a wayfarer. He is even urgent in pressing the truth upon his hearers. Or he is a champion for the defence of the truth, arguing vehemently with unbelievers. But all the while he never applies this truth to his own case. Saving others, he is himself a castaway (1 Corinthians 9:27). The pilot leads the imperilled mariners home, but is drowned himself. Surely this is the height of folly!
II. HE WHO IS TRULY WISE WILL PROFIT BY HIS WISDOM.
1. He will see the necessity of applying truth to himself. This will be a part of his wisdom. We are all sadly tempted to delude ourselves into a false sense of security, and we need light and guidance to show us our danger and our course of safety. It is a mark of God-given wisdom to choose that course.
2. He will recognize the practical bearings of truth. It will do little good to regard one's self only as a sort of example to which certain truths are attached. Mere self-examination of the most lucid and honest character will not save our souls. We have to go a step further, and act according to the knowledge that we gain in the light of God's truth.
3. He will find the application of wisdom directly helpful. When a man does not hold aloof from it as from some curiosity only to be inspected, but embraces the truth of Christ, taking it home to his own heart, he discovers that it is a saving truth. By the personal reception of this Divine wisdom he reaches the way of salvation. Above all, when we remember that Christ is "the Wisdom of God," we may see that for a man to receive that wisdom, i.e. to receive Christ, is to be wise for himself, because Christ brings the light of God's truth, and Christ's presence is the source of sure salvation.