I will run the way of your commandments, when you shall enlarge my heart.
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Augustine of Hippo
AD 430
30. But after he had said, "And pity me according to Thy law;" he mentioneth some of those blessings which he hath already obtained, that he may ask others that he hath not yet gained. For he saith, "I have chosen the way of truth: and Thy judgments I have not forgotten" (ver. 30). "I have stuck unto Thy testimonies: O Lord, confound me not" (ver. 31): may I persevere in striving toward the point whereunto I am running: may I arrive whither I am running! So then "it is not of him that willeth, nor of him that runneth, but of God that showeth mercy." He next saith, "I will run the way of Thy commandments, when Thou hast widened my heart" (ver. 32). I could not run hadst Thou not widened my heart. The sense of the words, "I have chosen the way of truth, and Thy judgments I have not forgotten: I have stuck unto Thy testimonies," is clearly explained in this verse. For this running is along the way of the commandments of God. And because he doth allege unto the Lord rather His blessings th...
Heart. Man runs, but God must impart grace. (Worthington)
An enlarged heart sometimes denotes the capacity of understanding, 3 Kings iv. 29. (Calmet)
But it is a singular mercy of God to make us love his commands. (St. Augustine)