Proverbs 20:5
Deep waters [are like] purpose in the heart of a man, and a man of understanding will draw it out.
Psalm 64:6
{They carefully plot} injustices [saying], "We have perfected {the perfect plot}!" Both [the] {inner thought} and heart of man [are] deep.
Proverbs 18:4
Deep waters [are] words of the mouth of a man; a gushing stream [is] a fountain of wisdom.
1 Corinthians 2:11
For who among men knows the things of a man, except the spirit of the man that [is] in him? Thus also no one knows the things of God except the Spirit of God.
Treasury of Scripture Knowledge
Summary
                            Counsel in the heart of man is like deep water; but a man of understanding will draw it out.                        
                    General references
Bible References
General references
                                        Proverbs 18:4                                        
                                                                                                                                Deep waters [are] words of the mouth of a man; a gushing stream [is] a fountain of wisdom.
                                    
                                        Psalm 64:6                                        
                                                                                                                                {They carefully plot} injustices [saying], "We have perfected {the perfect plot}!" Both [the] {inner thought} and heart of   man [are] deep.
                                    
                                        1 Corinthians 2:11                                        
                                                            
                        For who among men knows the things of a man, except the spirit of the man that [is] in him? Thus also no one knows the things of God except the Spirit of God.