The Amplified Bible adds [that Father from Whom all fatherhood takes its title and derives its name.
Ephesians 3:14-21 J.B. Phillips NT in Modern English ~
When I think of the greatness of this great plan, I fall to my knees before the Father from whom all fatherhood, (earthly or heavenly, derives its name) and I pray that out of the glorious richness of his resources he will enable you to know the strength of the Spirits inner reinforcement, that Christ may actually live in your hearts by your faith. And I pray that you, firmly fixed in love yourselves, may be able to grasp (with all Christians) how wide and deep and long and high is the love of Christ and to know for yourselves that love so far beyond our comprehension. May you be filled through all your being with God himself.
Understanding Fatherhood opens us to the identity He gives to each and every one which ultimately yields our security and confidence in His love.
A Father gives us life. Identity (which is defined as: the fact of being) comes from our Fathers. Fathers give us our name (identity) and (hopefully) an inheritance, and instinctively we understand a Father is someone who we are to depend on to provide and protect.
These are all human understandings that we have because fundamentally they are the nature of our Heavenly Father. He is the creator of all things.
Psalms reminds us that we, by the very hand of God, have been fearfully and wonderfully made. Ephesians goes on to remind us we are stamped, imprinted by the very plan of God not only with purpose and destiny but unlimited ability as we find our place in Him. That fact is that what we are we owe to the hand of God upon us. For we are his workmanship, created in Christ Jesus to do those good deeds which God planned for us to do. Ephesians 2:10
It is His heart that draws us, calling us to His family. Our Heavenly Father is the Father of Spirits. It is our Heavenly Father that gives breathe and life to the natural form.
With eternity in our hearts we begin our quest in this life, dependent upon natural fathers and mothers to show us this heavenly nature. We've all had to re learn "Father" as we have come into His family and yet thre is this constant cry from Him declaring,
You are wanted! You are valuable! You are accepted! Ephesians 1:
Once our hearts respond to Him through the New birth we begin this divine relationship, Galatians 4:6 it is because you really are his sons that God has sent the Spirit of his Son into your hearts to cry, Father, dear Father.
Romans 8:15 For you did not receive the spirit of slavery to fall back into fear, but you have received the spirit of adoption as sons, by whom we cry - abba Father.
To discover Him as Father begins the fulfillment of every heart need we have and begins with Paul's prayer here from Ephesians, to know His love.