That's what they say is the distance between the head and the heart. The Bible makes a parallel distinction between knowing, and tasting and seeing.
I've always known the truth behind Psalm 32,
Blessed is the one whose transgression is forgiven,whose sin is covered.
I've always known that it is good to be forgiven, that forgiveness is a gift, that forgiveness is something to be sought after and given away freely, but to taste and see that being forgiven is a blessing? That truth has for a long time been sitting 1.5 feet away.
Forgiveness brings peace, and a deep sense of fulfillment. When we lack that, we're probably lacking forgiveness. When we long for that, we're probably longing for forgiveness. When we feel cursed, it is probably because of our sin and its shameful exposure.
But God is good, and He is quick to forgive us our sin. He is quick to lift the curse which keeps us from Him, by the blood of His own son, and bestow upon us blessing after blessing after blessing,
I acknowledged my sin to you,and I did not cover my iniquity;I said, “I will confess my transgressions to the Lord,”and you forgave the iniquity of my sin.
My good friend Piper once said that grace is not just pardon, but power. And because of the power of grace, not only are we forgiven, but we also can forgive.