Romans 2:5

The δὲ contrasts what happens with what God designs. θησαυρίζεις σεαυτῷ ὀργήν : contrast our Lord's many sayings about “treasure in heaven” (Matthew 6:19 ff; Matthew 19:21). ἐν ἡμέρᾳ ὀργῆς = in the day of wrath. The conception was quite definite: there was only one day in view, what is elsewhere called “the day of the Lord” (2 Corinthians 1:14), “the day of judgment” (Matthew 11:22), “the last day” (John 6:39), “the day of God” (2 Peter 3:12), “that day” (2 Timothy 1:12), even simply “the day” (1 Corinthians 3:13; Hebrews 10:25). This great day is so defined in the Apostle's imagination that the article can be dispensed with. But see Psalms 110:5. (109:5. LXX.) It is a day when God is revealed as a righteous judge, in the sense of Psalms 61:13 (LXX).