"And David said unto him, Fear not: for I will surely shew thee kindness for Jonathan thy father's sake, and will restore thee all the land of Saul thy father; and thou shalt eat bread at my table continually" (2 Samuel 9: 7)
Meditate on that passage: "surely shew thee kindness".
What does the original Hebrew reveal to us?
"I will do do grace"
It is a superlative of God's grace for us.
He will do and do again nothing but good for us:
"Surely goodness and mercy shall follow me all the days of my life: and I will dwell in the house of the LORD for ever." (Psalm 23 6)
With the recognition of His superabundant goodness, we can understand passages like this one:
"Moreover the law entered, that the offence might abound. But where sin abounded, grace did much more abound:" (Romans 5: 20)
This superabundances helps us to understand why we receive and keep receiving the gift of righteousness and abundance of grace:
"For if by one man's offence death reigned by one; much more they which receive abundance of grace and of the gift of righteousness shall reign in life by one, Jesus Christ." (Romans 5: 17)
In spite of all the bad things which Mephibosheth had suffered, including the lameness in his feet because of the hurried nursemaid (2 Samuel 4: 4), David restored everything back to Him, and more, because he was honored with sitting at the same table as David the King, receiving the same honor if not double because of his father Jonathan:
"Thou preparest a table before me in the presence of mine enemies: thou anointest my head with oil; my cup runneth over." (Psalm 23: 5)
"He that spared not his own Son, but delivered him up for us all, how shall he not with him also freely give us all things?" (Romans 8: 32)
"Freely give" is actually "be gracious to us", just as David promised to Mephibosheth that he would be gracious, showing covenant kindness to him.
And today, we have that kindness showered on us, because of Jesus:
"3Blessed be the God and Father of our Lord Jesus Christ, who hath blessed us with all spiritual blessings in heavenly places in Christ: 4According as he hath chosen us in him before the foundation of the world, that we should be holy and without blame before him in love: 5Having predestinated us unto the adoption of children by Jesus Christ to himself, according to the good pleasure of his will, 6To the praise of the glory of his grace, wherein he hath made us accepted in the beloved." (Ephesians 1: 3-6)