At the beginning of Hosea 6 is a beautiful song of repentance.
This entire passage is in quotations marks—in the Bible I mean. It's the people's response to the Lord's rebuke and discipline to their unfaithfulness to Him. Once the song has ended though, the Lord says this:
The people's (Judah's) repentance did not last. It came when convenient and dissipated with the morrow.
It's a beautiful song, one I wish to frequently sing from the heart, but I fear it's one that, like Judah, I often cease far too quickly.