And to what is this astonishing change to be ascribed?

"Beloved, now we are children of God, and what we will be has not yet been made known. But we know that when He appears — we shall be like Him, for we shall see Him as He is!" 1 John 3:2-3

Let us endeavor to realize our present sonship; it will produce . . .
  boldness at His throne of grace;
  contrition at His cross;
  confidence in His Word;
  love to His person;
  contentment with our lot;
  victory over the world,
  zeal for His glory; and
  encouragement under all our trials and troubles!

We are either children of God — or enemies of God! Every child of God . . .
  mourns over sin,
  flies to the Savior, and
  departs from iniquity!
God is now his Father.
All the promises are his.
The eternal inheritance is his.

Let us look back to the rock from whence we were hewn, and to the hole of the pit from whence we were dug:
How base our origin — the dust!
How degraded our condition — slaves of sin and Satan!
How fearful our character — enemies to God!
How dreadful our eternal doom — the lake which burns with brimstone and fire!

Contrast this with . . .
our present relation — children of God;
our high standing — in heavenly places in Christ;
our glorious privilege — justified from all things;
our fixed destiny — to be forever with the Lord!

And to what is this astonishing change to be ascribed? To love — the love of God in Christ Jesus! "How great is the love the Father has lavished on us — that we should be called children of God! And that is what we are!" 1 John 3:1

What a mystery of mercy is this!
But if we are unbelievers — then we are . . .
  God's enemies,
  children of wrath,
  under the curse,
  in imminent danger!
Satan is our father!
Sin is our element!
Hell is our eternal portion!

Reader, are you a child of God?

If not, then you are the child of Satan!