Psalms 119:28

Here is, 1. David's representation of his own griefs: My soul melteth for heaviness, which is to the same purport with Psa 119:25, My soul cleaveth to the dust. Heaviness in the heart of man makes it to melt, to drop away like a candle that wastes. The penitent soul melts in sorrow for sin, and even the patient soul may melt in the sense of affliction, and it is then its interest to pour out its supplication before God. 2. His request for God's grace. (1.) That God would enable him to bear his affliction well and graciously support him under it: "Strengthen thou me with strength in my soul, according to thy word, which, as the bread of life, strengthens man's heart to undergo whatever God is pleased to inflict. Strengthen me to do the duties, resist the temptations, and bear up under the burdens, of an afflicted state, that the spirit may not fail. Strengthen me according to that word (Deu 33:25), As thy days so shall thy strength be." (2.) That God would keep him from using any unlawful indirect means for the extricating of himself out of his troubles (Psa 119:29): Remove from me the way of lying. David was conscious to himself of a proneness to this sin; he had, in a strait, cheated Ahimelech (Sa1 21:2), and Achish, Sa1 21:13 and Sa1 27:10.

— Matthew Henry's Concise Commentary (public domain)