Quoting Charles H. Spurgeon:
If we are born into God’s family, it is a miracle of mercy! It is one of the ever-blessed exhibitions of the infinite love of God which without any cause in us, has set itself upon us.
If you are this day an heir of heaven, remember you were once the slave of hell. Once you wallowed in the mire. If you should adopt a swine to be your child, you could not then have performed an act of greater compassion than when God adopted you!
And if an angel could exalt a gnat to equal dignity with himself, yet the gain would not be such a one as that which God has conferred on you.
He has taken you from the dunghill, and he has set you among princes! (“Sons of God”)