'It is I' in the Bible

which has come to you; even as it is in all the world and is bearing fruit and growing, as it does in you also, since the day you heard and knew the grace of God in truth;

For it is in Christ that the fulness of God's nature dwells embodied, and in Him you are made complete,

it is in him that you reach your full life, and he is the Head of every angelic Ruler and Power;