Let not mercy and truth forsake thee:
bind them about thy neck;
write them upon the table of thine heart:
Proverbs 3:3
"Bind them about thy neck — Keep them constantly in view.
Write them upon the table of thine heart - let them be thy moving principles;
feel them as well as see them.
Cook noted that,
"Mercy shuts out all selfishness and hate,
and that truth shuts out all falsehood, hypocrisy and deceit."
Adam Clarke/Coffman Commentaries