Beloved, now are we the sons of God, and it doth not yet appear what we shall be: but we know that, when he shall appear, we shall be like him; for we shall see him as he is.
And every man that hath this hope in him purifieth himself, even as he is pure.
I John 3:2-3
Now the Lord is that Spirit: and where the Spirit of the Lord is, there is liberty.
But we all, with open face beholding as in a glass the glory of the Lord, are changed into the same image from glory to glory, even as by the Spirit of the Lord.
2 Cor 3:17-18
EDIT : But note that it is not our goal in the sense that we are the ones actively doing it.