In a number of religious traditions, both Christian and non-Christian, the practice of ‘meditation’ is understood to be a non-verbal way of praying. This can often reflect a certain suspicion of propositional truth and verbal expression.
The relevant article in the International Standard Bible Encyclopedia provides helpful clarification:-
In the biblical world meditation was not a silent practice. [The underpinning Hebrew word] means “growl,” “utter” or “moan” as well as “meditate” or “muse.” No doubt meditation involved a muttering sound from reading half aloud or conversing with oneself. (cf. Ps 77:6) Consequently, translations can vary: e.g., in Job 15:4 “meditation” (RSV) is rendered “prayer” by the AV and “to speak” by the NEB; in the AV Ps 5:1 (MT 2) has, “O Lord, consider my meditation,” but the RSV has “give heed to my groaning” and the NEB “consider my inmost thought.”
Meditation takes place any time of the day or night. (Jos 1:8 Ps 1:2) It produces inward strength and joy. (Ps 63:5f) The object of meditation is particularly the law with its precepts, (Ps 119:15) statutes (v 48), testimonies (v 99), and promises (v 148). The glorious splendor of God’s majesty, along with his wondrous works or miracles, is also the content of meditation. (Ps 143:5 145:5) Meditation takes place in the heart, the seat of the emotional and rational life. Therefire, the psalmist prays that the meditation of his heart will be acceptable in God’s sight, (Ps 19:14 104:34) i.e., he wants his inner thoughts to approach the standard God approves. Thus the righteous, when they encounter the plots of the wicked, maintain a pure mind by meditating on God’s law. (Ps 119:23)
…As Paul taught Timothy, the mind is to be occupied with spiritual matters to increase spiritual growth (1 Tim 4:15, using Gk RSV “practice,” AV “meditate”).