It is truly singular that Plato,--whose philosophy and religion were but exotic at home, and a mere opposition to the finite in all things, genuine prophet and anticipator as he was of the Protestant Christian aera,--should have given in his Dialogue of the Banquet, a justification of our Shakspeare. For he relates that, when all the other guests had either dispersed or fallen asleep, Socrates only, together with Aristophanes and Agathon, remained awake, and that, while he continued to drink with them out of a large goblet, he compelled them, though most reluctantly, to admit that it was the business of one and the same genius to excel in tragic and comic poetry, or that the tragic poet ought, at the same time, to contain within himself the powers of comedy. [1] Now, as this was directly repugnant to the entire theory of the ancient critics, and contrary to all their experience, it is evident that Plato must have fixed the eye of his contemplation on the innermost essentials of the drama, abstracted from the forms of age or country. In another passage he even adds the reason, namely, that opposites illustrate each other's nature, and in their struggle draw forth the strength of the combatants, and display the conqueror as sovereign even on the territories of the rival power. Nothing can more forcibly exemplify the separative spirit of the Greek arts than their comedy as opposed to their tragedy. But as the immediate struggle of contraries supposes an arena common to both, so both were alike ideal; that is, the comedy of Aristophanes rose to as great a distance above the ludicrous of real life, as the tragedy of Sophocles above its tragic events and passions;--and it is in this one point, of absolute ideality, that the comedy of Shakspeare and the old comedy of Athens coincide. In this also alone did the Greek tragedy and comedy unite; in every thing else they were exactly opposed to each other. Tragedy is poetry in its deepest earnest; comedy is poetry in unlimited jest. Earnestness consists in the direction and convergence of all the powers of the soul to one aim, and in the voluntary restraint of its activity in consequence; the opposite, therefore, lies in the apparent abandonment of all definite aim or end, and in the removal of all bounds in the exercise of the mind,--attaining its real end, as an entire contrast, most perfectly, the greater the display is of intellectual wealth squandered in the wantonness of sport without an object, and the more abundant the life and vivacity in the creations of the arbitrary will.