In the next stanza Jonson says “Seven years thouwert lent to me, and I thee pay, exacted by thy fate, on the just day.” This is how we know his son was seven when he died. Here Jonson is admitting that life is a gift from God which again shows his profound love for god, Next Jonson uses a metaphor by saying "I thee pay" this means that Jonson must now "pay back" his son and that he was taken as a means of paying back his ‘debt’. This metaphor continues when Jonson uses the phrase "exacted by thy fate". "Exacted" means something like demanded, only more in the sense of a punishment.