ABBA
See also: God, as Father
Because you are sons, God sent the Spirit of his Son into our hearts, the Spirit who calls out, “Abba, Father.”
The Bible, Galatians 4:6
Christ asserted that he had a relationship with God which no one ever claimed before. It comes out in the Aramaic word Abba which He was so fond of using, especially in prayer. Nobody before Him in all the history of Israel had addressed God by this word. … Abba is the familiar word of closest intimacy.
Michael Green
“Abba” is only a little word, and yet contains everything. It is not the mouth but the heart’s affection which speaks like this. Even if I am oppressed with anguish and terror on every side, and seem to be forsaken and utterly cast away from your presence, yet am I your child, and you are my Father. For Christ’s sake: I am loved because of the Beloved. So this little word “Abba”, Father, deeply felt in the heart, surpasses all the eloquence of Demosthenes, Cicero, and the most eloquent speakers that ever lived. This matter is not expressed with words, but with groanings, and these groanings cannot be uttered with any words of eloquence, for no tongue can express them.
Martin Luther