• Proverbs 4:23
  Keep your heart with all diligence,
  For out of it spring the issues of life.
  
   
• Matthew 5:28
  But I say to you that whoever looks at a woman to lust for her has already committed adultery with her in his heart.
   

Related Scriptures

• Jeremiah 17:9
  " The heart is deceitful above all things,
  And desperately wicked;
  Who can know it?