1 Thessalonians concludes with a to do list of 15 commands for the believer and then states that God is faithful and He will do it. Seems like a contradiction but it is actually the key to growing in our faith.
One of the themes in the prophets is their call of exhortation to God’s people. The call can be to get back to Torah observance, or justice or it in case of Haggai to stop procrastinating. We get to learn from how God shepherds His people during periods of “we will do it later” and gain wisdom for our own tendencies.