Because Hezekiah was deeply committed to his faith, God blessed him, and he succeeded in all his endeavors. Hezekiah began a series of reforms, including:
cleaning, repairing, and renovating the temple (2 Chronicles 29:3–36);
celebrating the Passover (2 Chronicles 30); and
restoring important worship practices in Judah (2 Chronicles 31:1–19).
He rebelled against the king of Assyria: In the ancient Near East, rebellions and stopping tribute payments often happened when a new ruler took power. King Sennacherib of Assyria replaced Sargon II in 704 BC. Assyria's focus on issues in southern Mesopotamia at that time might have encouraged Hezekiah. Assyria responded by invading Judah in 701 BC (2 Kings 18:13–19:36).
He also defeated the Philistines, who had been a threat during Ahaz's rule (2 Chronicles 28:18).