Artistic license Puns

Descartes and Shakespeare were having a debate on how best to write. Descartes argued up and down that prose was the only way to really get your ideas across and that artistic license just muddied everything up. Shakespeare argued poetry and turns of phrase made the material more relatable and thus easier to get across. Descartes countered, "But how do you know what the best form is?" Shakespeare thought about it and replied, "I think, therefore iamb."