Gen 1:4

1:4 light. God is the ultimate source of the daylight that alternates with darkness; the sun is later introduced as the immediate cause (vv. 14–18; v. 5 and note). Light symbolizes life and blessing (Ps. 4:7; 56:13; Is. 9:2; John 1:4, 5).

good. Brought within God’s constraints, even the darkness and watery deep (vv. 2, 10) are now “good,” serving God’s benevolent purposes (Ps. 104:19–26). The creation bears witness to God’s handiwork (Ps. 19:1–6).

separated. The Hebrew here is also translated “set apart.” Separation is fundamental both to creation and to Israel’s existence (3:15; 4:1–17; 12:1; Lev. 20:24, 25; Num. 8:14).