Charles H. Spurgeon on Psalms 43:2

The Spirit of the word, the Holy Spirit that useth to accompany the word to them that receive it. By his Spirit God is in a believer 1Co 6:9 Eph 2:1-22; and this is the spirit of strength and power. Eph 3:16 2 Ti 1:7. As a powerful, active soul makes a vigorous body, so the Spirit in the soul makes the soul powerful and strong, being the soul of the soul of a believer. We read more than once or twice in the Scriptures, that when believers did any eminent act, it is said, the Spirit of the Lord came upon them, and they did so and so, i.e., the Spirit of God in them did them put forth its power to make them act powerfully. Condensed from Nathanael Homes.