Few poets would tell their own soul to digest something, but Donne does it in the first line. "Wilt thou love God, as he thee? Then digest, / My soul, this wholesome meditation." The question and the instruction collide before the line is even over. Meditation becomes food, something to be taken in, chewed over and absorbed. That homely image sets the tone for a sonnet that keeps pulling vast theology down to the level of the household, the courtroom and the marketplace.
The argument is simple. If you want to love God as much as he loves you, you first have to understand how much that is. The poem then moves through the Trinity one person at a time. The Holy Spirit, "by angels waited on / In heaven", still "doth make his Temple in thy breast", and the contrast between a heavenly court and one human chest is deliberately startling. The Father, who has "begot a Son most blest", has "deigned to choose thee by adoption", making you "Co-heir t' his glory, and Sabbath' endless rest." The vocabulary here is legal and familial, a matter of inheritance and belonging. The parenthesis "(for he ne'er be gone)" reads like an insistence that the Father's act of begetting never ceases.
The Son's section is where Donne takes his biggest risk. He compares redemption to a robbed man who discovers his "stol'n stuff" for sale and finds he "must lose or buy 't again." The word "stuff" is blunt and almost sneering, and it is applied to human souls. The picture is unfair on purpose. The owner has to pay for what was already his, and Satan appears as a common thief. So Christ's death is presented as a transaction forced on God by theft. The line "Us whom he'd made, and Satan stol'n, to unbind" also quietly widens the poem. Until now the speaker has addressed "thee" and "my soul". Here it becomes "us", and one private meditation turns into a statement about everyone.
The form shows Donne's skill. The octave rhymes ABCAACBA: "digest", "breast", "blest" and "rest" frame the eight lines, while "meditation" and "adoption" and "on" and "gone" are nested inside like a mirror. The sestet runs DEEDFF. "Find" and "unbind" enclose "again" and "slain", which puts the price and the death in the middle of the rhyme. Then the final couplet closes the argument. The metre is iambic pentameter, but it is strained and crowded. Elisions such as "t'" and "Sabbath'" squeeze syllables to fit the line, and a heavy opening like "love God" has to be forced against the beat. The poem sounds like someone thinking hard, not reciting.
All that complexity gives way to plainness at the end. "'Twas much that man was made like God before, / But, that God should be made like man, much more." The last line is made entirely of one-syllable words. The phrase "made like God" is reversed into "made like man", so the grammar performs the reversal it describes. The comma after "But" makes the voice hesitate before the claim, and "much more" is an understatement that lands harder than any exclamation. Being made in God's likeness is already a great honour, and God taking on human likeness is greater still.
The sonnet matters because it shows how Donne, one of the best-known metaphysical poets, can make doctrine feel urgent and personal. He argues with his own soul, borrows images from property law, and trusts the simplest words to carry the most astonishing idea. The opening question has a quiet answer. To love God, the soul does not need to do more. It needs to understand how far God has already gone.