Charles H. Spurgeon on Psalms 119:28

My soul melteth for heaviness. In the original the word signifies, "droppeth away." The Septuagint hath it thus: "My soul fell asleep through weariness." Probably by a fault of the transcribers, putting one word for another. My soul droppeth. It may relate (1) to the plenty of his tears, as the word is used in Scripture: "My friends scorn me: but mine eye poureth out tears unto God" (Job 16:20), or droppeth to God, the same word; so it notes his deep sorrow and sense of his condition. The like allusion is in Joshua 7:5; "The heart of the people melted, and became as water." Or (2) it relates to his languishing under the extremity of his sorrow; as an unctuous thing wasteth by dropping, so was his soul even dropping away. Such a like expression is used in Psalms 117:96: "Their soul is melted because of trouble"; and of Jesus Christ, whose strength was exhausted by the greatness of his sorrows, it is said, Psalms 22:14, "I am poured out like water, and all my bones are out of joint: my heart is like wax; it melteth in the midst of my bowels." Be the allusion either to the one or to the other; either to the dropping of tears, or to the melting and wasting away of what is fat or unctuous, it notes a vehement sorrow, and brokenness of heart. So much is clear, his soul was even melting away, and unless God did help, he could hold out no longer. Thomas Manton.