Pro 3:1 My son, forget not my law; but let thine heart keep my commandments:
Pro 3:2 For length of days, and long life, and peace, shall they add to thee.
Pro 3:3 Let not mercy and truth forsake thee: bind them about thy neck; write them upon the table of thine heart:
Pro 3:4 So shalt thou find favour and good understanding in the sight of God and man.
I find it interesting it says to do more than just to keep the commandments, it says to do so with our hearts. We do not have all the laws that the Israelite had at the time, but we can apply this to what we're supposed to be doing now. Some days, we do what we need to do because we need to do it, but ideally we should be doing what we need to do because we want to, not because we have to (though like anything else sometimes we have to fake it until we make it on that front). Wanting to do the right thing also makes it more likely we'll remember to do the right thing!
It says not to let mercy and truth go away, we're to keep them with us at all times, again referencing the heart and keeping them there.