Q. What is meant by praying in the Spirit? — A. Our praying with the gifts, and especially with the grace of the Spirit, Jude 20, 1 Cor. 14:15, Rom. 8:26.

Q. Wherein do the gift and grace of prayer differ? — A. The gift of prayer lieth in conceiving and uttering suitable expressions in an affecting manner; but the grace of prayer lies in the fervency of our desire after God.

John Brown of Haddington, Questions and Answers on the Shorter Catechism, 338.