Psalms 49:3

3. My mouth shall speak of wisdom The prophet was warranted in applying these commendatory terms to the doctrine which he was about to communicate. It is, no doubt, by plain appeals to observation that we find him reproving human folly; but the general principle upon which his instruction proceeds is one by no means obvious to the common sense of mankind, not to say that his design in using such terms is less to assert the dignity of his subject than simply to awaken attention. This he does all the more effectually by speaking as one who would apply his own mind to instruction rather than assume the office of exhortation. He puts himself forward as an humble scholar, one who, in acting the part of teacher, has an eye at the same time to his own improvement. It were desirable that all the ministers of God should be actuated by a similar spirit, disposing them to regard God as at once their own teacher and that of the common people, and to embrace in the first place themselves that divine word which they preach to others. The Psalmist had another object in view. He would secure the greater weight and deference to his doctrine by announcing that he had no intention to vend fancies of his own, but to advance what he had learned in the school of God. This is the true method of instruction to be followed in the Church. The man who holds the office of teacher must apply himself to the reception of truth before he attempt to communicate it, and in this manner become the means of conveying to the hands of others that which God has committed to his own. Wisdom is not the growth of human genius. It must be sought from above, and it is impossible that any should speak with the propriety and knowledge necessary for the edification of the Church, who has not, in the first place, been taught at the feet of the Lord. To condescend upon the words, some read in the third verse, And the meditation of my heart shall speak of understanding But as it were a harsh and improper expression to say that the meditation of the heart speaks, I have adopted the simpler reading.