Divine grace, that which comes from God and is our example, is His display of unmerited favor. It is directly related to His forgiving us when we don't deserve forgiveness. It means undeserving kindness.

It appears that your T may have meant that you are most forgiving of other people's faults, being kind to them even when they don't deserve it. You may extend a hand of friendship, and peacefulness to others, whether you find them likable or not, or whether they are doing things you approve of or not.

Do you see how you can show yourself such favor in life? I think in slang it means: give yourself some slack!