What does Psalm 43:3 mean?

This echoes a reference seen in the prior psalm (Psalm 42:4) which seems to refer to the temple in Jerusalem. The "holy hill" is also referred to elsewhere in the Book of Psalms (Psalm 48:1; 87:1; 99:9). The tabernacle was erected there, and later Solomon built the temple in the same spot. God met with His people at the tabernacle and then at the temple. Habakkuk 2:20 affirms that "the LORD is in his holy temple."

Biblical references to "light" imply truth, knowledge, goodness, and life (2 Samuel 23:4; Psalm 18:28; 27:1; 97:11; John 8:12). "Truth," in the Psalms, often refers to the recorded Word of God: to Scripture (Psalm 25:5; 86:11; 119:160). In this case, the psalmist may also have been thinking of the remarkable guidance the Lord provided during Israel's journey through the wilderness. He provided a cloud to lead them by day and a pillar of fire to lead them by night (Exodus 13:21–22). Today God's Spirit guides believers by granting them understanding through God's truth, His holy Word. Jesus promised His disciples that the Holy Spirit would teach them all things (John 14:26; cf. 1 Corinthians 2:6–16), and He identified God's Word as truth (John 17:17).