NIV Deuteronomy 4:29
But if from there you seek the LORD your God, you will find him if you look for him with all your heart and with all your soul.
NIV 1 Chronicles 28:9
"And you, my son Solomon, acknowledge the God of your father, and serve him with wholehearted devotion and with a willing mind, for the LORD searches every heart and understands every motive behind the thoughts. If you seek him, he will be found by you; but if you forsake him, he will reject you forever.
NIV 2 Chronicles 30:18-19
18. Although most of the many people who came from Ephraim, Manasseh, Issachar and Zebulun had not purified themselves, yet they ate the Passover, contrary to what was written. But Hezekiah prayed for them, saying, "May the LORD, who is good, pardon everyone
19. who sets his heart on seeking God--the LORD, the God of his fathers--even if he is not clean according to the rules of the sanctuary."
NIV Jeremiah 29:13
You will seek me and find me when you seek me with all your heart.