And I will put my spirit within you, and cause you to walk in my statutes, and ye shall keep my judgments, and do them.

Wesley's Notes

36:27 My spirit - The holy spirit of God, which is given to, and dwelleth in all true believers. And cause you - Sweetly, powerfully, yet without compulsion; for our spirits, framed by God's spirit to a disposition suitable to his holiness, readily concurs. Ye shall keep - Be willing; and able to keep the judgments, and to walk in the statutes of God, which is, to live in all holiness.

Jamieson-Fausset-Brown Bible Commentary

27. my spirit-(Eze 11:19; Jer 32:39). The partial reformation at the return from Babylon (Ezr 10:6, &c.; Ne 8:1-9:38) was an earnest of the full renewal hereafter under Messiah.

Matthew Henry's Concise Commentary

36:25-38 Water is an emblem of the cleansing our polluted souls from sin. But no water can do more than take away the filth of the flesh. Water seems in general the sacramental sign of the sanctifying influences of the Holy Ghost; yet this is always connected with the atoning blood of Christ. When the latter is applied by faith to the conscience, to cleanse it from evil works, the former is always applied to the powers of the soul, to purify it from the pollution of sin. All that have an interest in the new covenant, have a new heart and a new spirit, in order to their walking in newness of life. God would give a heart of flesh, a soft and tender heart, complying with his holy will. Renewing grace works as great a change in the soul, as the turning a dead stone into living flesh. God will put his Spirit within, as a Teacher, Guide, and Sanctifier. The promise of God's grace to fit us for our duty, should quicken our constant care and endeavour to do our duty. These are promises to be pleaded by, and will be fulfilled to, all true believers in every age.