A couple of verses stuck out to me. The last part of 1:6 says, "And he who earns wages does so to put them into a bag with holes." Sounds alot like the way we manage our funds all to often!
The other one that stuck out is right after the people repent.
Haggai 1:13 (ESV)
The Haggai, the messenger of the Lord, spoke to the people with the Lord's message, "I am with you, declares the Lord."
It's not overstated. It's not flowery. But if you think about it, that's ultimately all we want to know. Is God with us? It's awesome when we're confidant he is!
(Hebrews 12:26 refers back to Haggai 2:6,21.)