8:3 your heavens Psalms often express praise for God as the Creator (Pss 33:6–7; 104:1–30). These praises are meant to inspire awe and respect at Yahweh’s sovereign power (33:8–9).
your fingers The finger of God symbolizes His power: Pharaoh’s magicians attributed the third plague to the finger of God (Exod 8:19); the finger of God wrote the law on stone tablets (Exod 31:18; Deut 9:10); and in the nt, Jesus cast out demons by the finger of God (Luke 11:20).
8:4 that you think of him The psalmist marvels that God—the supreme Creator—involves Himself with humanity.
Job uses a similar phrase but with a different emphasis. Instead of wondering at God’s care, Job—in the midst of his suffering—wishes God would leave him alone (Job 7:17–21).
8:3–4 The vastness of creation is contrasted with the smallness and insignificance of a human being. This is in the form of a question: How is it that God would remember and look after (both words mean “pay attention to and care for”) people? This is perplexing in light of the difference between the size and scope of the cosmos and the relative puniness of humanity. The terms “human being” and son of man are parallel and are used to describe humankind as a collective whole (146:3; Nm 23:19; Is 51:12).
3, 4. The allusion to the magnificence of the visible heavens is introduced for the purpose of illustrating God’s condescension, who, though the mighty Creator of these glorious worlds of light, makes man the object of regard and recipient of favor.
4. man—literally, “frail man,” an allusion to his essential infirmity.
son of man—only varies the form of speech.
visitest—in favor (Ps 65:10). This favor is now more fully illustrated.