14. Let the words of my mouth, and the meditation of my heart. David asks still more expressly to be fortified by the grace of God, and thus enabled to live an upright and holy life. The substance of the verse is this: I beseech thee, O God, not only to keep me from breaking forth into the external acts of transgression, but also to frame my tongue and my heart to the obedience of thy law. We know how difficult it is, even for the most perfect, so to bridle their words and thoughts, as that nothing may pass through their heart or mouth which is contrary to the will of God; and yet this inward purity is what the law chiefly requires of us. Now, the rarer this virtue — the rarer this strict control of the heart and of the tongue is, let us learn so much the more the necessity of our being governed by the Holy Spirit, in order to regulate our life uprightly and honestly. By the word acceptable, the Psalmist shows that the only rule of living well is for men to endeavor to please God, and to be approved of him. The concluding words, in which he calls God his strength and his redeemer, he employs to confirm himself in the assured confidence of obtaining his requests.