@trismegisto,
Here are scripture references concerning the heart,
Issues of life are out of Pr 4:23
God
Tries. 1Ch 29:17; Jer 12:3
Knows. Ps 44:21; Jer 20:12
Searched. 1Ch 28:9; Jer 17:10
Understands the thoughts of. 1Ch 28:9; Ps 139:2
Ponders. Pr 21:2; 24:12
Influences. 1Sa 10:26; Ezr 6:22; 7:27; Pr 21:1; Jer 20:9
Creates a new. Ps 51:10; Eze 36:26
Prepares. 1Ch 29:18; Pr 16:1
Opens. Ac 16:14
Enlightens. 2Co 4:6; Eph 1:18
Strengthens. Ps 27:14
Establishes. Ps 112:8; 1Th 3:13
Should be
Prepared to God. 1Sa 7:3
Given to God. Pr 23:26
Perfect with God. 1Ki 8:61
Applied to wisdom. Ps 90:12; Pr 2:2
Guided in the right. Pr 23:19
Purified. Jas 4:8
Single. Eph 6:5; Col 3:22
Tender. Eph 4:32
Kept with diligence. Pr 4:23
We should
Believe with. Ac 8:37; Ro 10:10
Serve God with all. De 11:13
Keep God's statutes with all. De 26:16
Walk before God with all. 1Ki 2:4
Trust in God with all. Pr 3:5
Love God with all. Mt 22:37
Return to God with all. De 30:2
Do the will of God from. Eph 6:6
Sanctify God in. 1Pe 3:15
Love one another with a pure. 1Pe 1:22
No man can cleanse Pr 20:9
Faith, the means of purifying Ac 15:9
Renewal of, promised under the gospel Eze 11:19; 36:26; Heb 3:10
When broken and contrite, not despised by God Ps 51:17
The pure in, shall see God Mt 5:8
Pray that it may be
Cleansed. Ps 51:10
Inclined to God's testimonies. Ps 119:36
United to fear God. Ps 86:11
Directed into the love of God. 2Th 3:5
Harden not, against God Ps 95:8; Heb 4:7
Harden not against the poor De 15:7
Regard not iniquity in Ps 66:18
Take heed lest it to be deceived De 11:16
Know the plague of 1Ki 8:38
He that trusts in, is a fool Pr 28:26