Jeremiah 32.36, 41 ESV
“Now therefore, thus says the Lord,… ‘I will rejoice in doing them good, and I will plant them in this land in faithfulness, with all my heart and all my soul.’”
Have you ever fully committed yourself to a project, being single-minded and totally focused on the goal? You blanked out the pain, rolled up your sleeves, and got to work. When the job was done, you wiped your brow and thought with satisfaction, “It’s amazing what I can accomplish if I just get after it;” that is, “with all my heart and all my soul”.