Vs. 55 — I remember Your name in the night, O Lord, And I keep Your law.

John Calvin:

David exhorts that the remembrance of God is the only remedy for preserving us in his fear, and in the observance of his law; and assuredly, as often as his majesty occurs to our minds, it will tend to humble us, and the very thought of it will provoke us to the cultivation of godliness.

William S. Plumer:

There is never a time in which it is not proper to turn to God and think on his name. In the darkness of midnight, in the darkness of mental depression, in the darkness of outward providences, God is still a fitting theme. (Spurgeon, C. H. (2009). The treasury of David: Psalms 111-119 (Vol. 5, p. 251). Bellingham, WA: Logos Bible Software.)

Prayer:

I remember Your name in the night, O Lord, and I keep Your law. In times of heaviness, my Lord, refresh my mind with the glory of Your name. Your name is a strong tower–my strong tower. The night will not last forever, and joy comes in the morning.