This is John Donne’s Holy Sonnet 15.
The last two lines…. if all I ever preach is that, I’ll have done ok….
Wilt thou love God as he thee ? then digest,
My soul, this wholesome meditation,
How God the Spirit, by angels waited on
In heaven, doth make His temple in thy breast.
The Father having begot a Son most blest,
And still begetting—for he ne’er begun—
Hath deign’d to choose thee by adoption,
Co-heir to His glory, and Sabbath’ endless rest.
And as a robb’d man, which by search doth find
His stolen stuff sold, must lose or buy it again,
The Sun of glory came down, and was slain,
Us whom He had made, and Satan stole, to unbind.
‘Twas much, that man was made like God before,
But, that God should be made like man, much more.