1CH 28:9

9 And thou, Sh'lomo beni [(my son)], know thou the Elohei Avicha, and serve Him with a lev shalem and with a nefesh chafetzah [(willing mind)], for Hashem searcheth kol levavot, and understandeth all the yetzer machashavot. If thou seek Him, He will be found by thee; but if thou forsake Him, He will cast thee off forever.