we need our hearts every day (of our lives).
To get the best out of our hearts, we need to give the best to our hearts. In other words, if you want your heart to treat you well, treat it well too.
2 Cor 13:5 - Examine and test and evaluate your own selves to see whether you are holding to your faith and showing the proper fruits of it. Test and prove yourselves [not Christ]. Do you not yourselves realize and know [thoroughly by an ever-increasing experience] that Jesus Christ is in you--unless you are [counterfeits] disapproved on trial and rejected?***
Gal 6:4 - But let every person carefully scrutinize and examine and test his own conduct and his own work. He can then have the personal satisfaction and joy of doing something commendable [in itself alone] without [resorting to] boastful comparison with his neighbor.***
Ps 26:2 - Examine me, O Lord, and prove me; test my heart and my mind.***
Ps 139:23 - Search me [thoroughly], O God, and know my heart! Try me and know my thoughts!***One more thing: you can exercise your heart by sharing this "Heart truth" with others...
*God's Word Translation