The color of Savonarola's flesh was brown: his nerves were exquisitely sensitive yet strong; like a network of wrought steel, elastic, easily overstrained, they recovered their tone and temper less by repose than by the evolution of fresh electricity.

With Savonarola fasts were succeeded by trances, and trances by tempests of vehement improvization.
From the midst of such profound debility that he could scarcely crawl up the pulpit steps, he would pass suddenly into the plenitude of power, filling the Dome of Florence with denunciations, sustaining his discourse by no mere trick of rhetoric that flows to waste upon the lips of shallow preachers, but marshaling the phalanx of embattled arguments and pointed illustrations, pouring his thought forth in columns of continuous flame, mingling figures of sublimest imagery with reasonings severest accuracy, at one time melting his audience tears, at another freezing them with terror, again quickening their souls with prayers and pleadings and blessings that had in them the sweetness of the very spirit of Christ.

His sermons began with scholastic exposition; as they advanced, the ecstasy of inspiration fell upon the preacher, till the sympathies of the whole people of Florence gathered round him,[2] met and attained, as it were, to single consciousness in him.

He then no longer restrained the impulse of his oratory, but became the mouthpiece of God, the interpreter to themselves of all that host.

In a fiery crescendo, never flagging, never losing firmness of grasp or lucidity of vision, he ascended the altar steps of prophecy, and, standing like Moses on the mount between the thunders of God and the tabernacles of the plain, fulminated period after period of impassioned eloquence.