God looks on the heart

“But the Lord said to Samuel, “Do not look on his appearance or on the height of his stature, because I have rejected him. For the Lord sees not as man sees: man looks on the outward appearance, but the Lord looks on the heart.” (1 Sam. 16:7 ESV)

God searches the heart

“I the Lord search the heart and test the mind, to give every man according to his ways, according to the fruit of his deeds.” (Jer. 17:10 ESV)

The pure in heart shall see God

“Blessed are the pure in heart, for they shall see God.” (Matt. 5:8 ESV)

God can create a new and heart within you

“Create in me a clean heart, O God, and renew a right spirit within me.” (Psalm 51:10 ESV)

“And I will give you a new heart, and a new spirit I will put within you. And I will remove the heart of stone from your flesh and give you a heart of flesh.” (Ez. 26:36 ESV)

Keep your heart with all vigilance

“Keep your heart with all vigilance, for from it flow the springs of life.” (Prov. 4:23 ESV)

Use the Word of God to discern the hearts thoughts and intentions

“For the word of God is living and active, sharper than any two-edged sword, piercing to the division of soul and of spirit, of joints and of marrow, and discerning the thoughts and intentions of the heart.” (Heb. 4:12 ESV)

Trust in the Lord with all your heart

“Trust in the Lord with all your heart, and do not lean on your own understanding. In all your ways acknowledge him, and he will make straight your paths.” (Prov. 3:5-6 ESV)