Joel Beeke:

After reading Scripture, we must ask God for light to scrutinize our hearts and lives, then meditate upon the Word. Disciplined meditation on Scripture helps us focus on God. Meditation helps us view worship as a discipline. It involves our mind and understanding as well as our heart and affections. It works Scripture through the texture of the soul. Meditation helps prevent vain and sinful thoughts (Matt. 12:35), and provides inner resources on which to draw (Ps. 77:10-12), including direction for daily life (Prov. 6:21-22). Meditation fights temptation (Ps. 119:11, 15), provides relief in afflictions (Isa. 49:15-17), benefits others (Ps. 145:7), and glorifies God (Ps. 49:3).

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Quoted in Feed My Sheep: A Passionate Plea for Preaching. 2nd edition, 2008 by Reformation Trust Publishing, an imprint of Ligonier Ministries. Available here.