Psalms 108:1

We may here learn how to praise God from the example of one who was master of the art. 1. We must praise God with fixedness of heart. Our heart must be employed in the duty (else we make nothing of it) and engaged to the duty (Psa 108:1): O God! my heart is fixed, and then I will sing and give praise. Wandering straggling thoughts must be gathered in, and kept close to the business; for they must be told that here is work enough for them all. 2. We must praise God with freeness of expression: I will praise him with my glory, that is, with my tongue. Our tongue is our glory, and never more so than when it is employed in praising God. When the heart is inditing this good matter our tongue must be as the pen of a ready writer, Psa 45:1. David's skill in music was his glory, it made him famous, and this should be consecrated to the praise of God; and therefore it follows, Awake my psaltery and harp. Whatever gift we excel in we must praise God with. 3. We must praise God with fervency of affection, and must stir up ourselves to do it, that it may be done in a lively manner and not carelessly (Psa 108:2): Awake, psaltery and harp; let it not be done with a dull and sleepy tune, but let the airs be all lively.

— Matthew Henry's Concise Commentary (public domain)