Now, though thy thoughts are green and tender, as becometh one so young, yet are they those of a thinking brain, and in truth thou dost bring back to my mind certain of those old philosophers with whom in days bygone I have disputed at Athens, and at Becca in Arabia, for thou hast the same crabbed air and dusty look, as though thou hadst passed thy days in reading ill-writ Greek, and been stained dark with the grime of manuscripts.