On My First Sonne
Hebrew name meaning
"Child of my right hand" translates Benjamin, the boy's actual name. The right hand signals favor and blessing in biblical terms.
Loan theology
Puritan doctrine held children were "lent" by God, not owned. Jonson uses financial vocabulary—lent, pay, exacted—to frame his son's death as a transaction coming due.
Double meaning
"Piece" means both a work of art and a fragment/part of himself. He's calling his dead son better poetry than anything he wrote.
Final vow
"Like" here means desire intensely, not just enjoy. He's vowing never to want anything too much again—love made him vulnerable to this pain.