And, since the thoughts and reasonings of an author have, as I have said, a personal character, no wonder that his style is not only the image of his subject, but of his mind. That pomp of language, that full and tuneful diction, that felicitousness in the choice and exquisiteness in the collocation of words, which to prosaic writers seems artificial, is nothing else but the mere habit and way of a lofty intellect. Aristotle, in his sketch of the magnanimous man, tells us that his voice is deep, his motions slow, and his stature commanding. In like manner, the elocution of a great intellect is great. His language expresses, not only his great thoughts, but his great self. Certainly he might use fewer words than he uses; but he fertilizes his simplest ideas, and germinates into a multitude of details, and prolongs the march of his sentences, and sweeps round to the full diapason of his harmony, as if [kudei gaion], rejoicing in his own vigour and richness of resource. I say, a narrow critic will call it verbiage, when really it is a sort of fulness of heart, parallel to that which makes the merry boy whistle as he walks, or the strong man, like the smith in the novel, flourish his club when there is no one to fight with.
Shakespeare furnishes us with frequent instances of this peculiarity, and all so beautiful, that it is difficult to select for quotation. For instance, in Macbeth:—
"Canst thou not minister to a mind diseased,
Pluck from the memory a rooted sorrow,
Raze out the written troubles of the brain,
And, with some sweet oblivious antidote,
Cleanse the foul bosom of that perilous stuff,
Which weighs upon the heart?"
Here a simple idea, by a process which belongs to the orator rather than to the poet, but still comes from the native vigour of genius, is expanded into a many-membered period.
Source: "Literature" (1858), via newmanreader.org