"God helps those who help themselves!"
This verse, of course, is not in the Bible. Hezekiah sounds plausible enough, but is not a real book of scripture. "Yeah! That's from the book of Hezekiah, isn't it?" is the code-word for these kinds of phantom texts.
This would seem old news by now, but just recently a friend of ours was scandalized when we told her this "verse" did not exist.
More important, this "verse" is unbiblical in its meaning. It is exactly the opposite of the message of scripture.
Jer 17:5 (NIV) This is what the LORD says: "Cursed is the one who trusts in man, who depends on flesh for his strength and whose heart turns away from the LORD."
Prov 28:26 (NIV) He who trusts in himself is a fool...