Hezekiah's 1,777 foot long tunnel was a noteworthy accomplishment. It brought water from the Gihon spring outside the city wall, under the wall of Jerusalem, and into the city, specifically to the pool of Siloam. This made Jerusalem much more self-sufficient in times of invasion than it would have been otherwise.126
Hezekiah's reign was one of the best in Judah's history because of the king's humility and dependence on God evidences of which the writer of Kings provided in abundance. Judah declined from then on, however, because most of the subsequent kings were wicked. Judah fell to the Babylonians exactly 100 years after Hezekiah died.127
"Perhaps Hezekiah's only serious flaw is his inability to prepare Manasseh, his successor, to be like himself. On the other hand, how can anyone guarantee the quality of their children's life choices?"128