Meaning of the term “execution”

By the term Execution, I understand the right mechanical use of the means of art to produce a given end.

The first quality of execution is truth

All qualities of execution, properly so called, are influenced by, and in a great degree dependent on, a far higher power than that of mere execution—knowledge of truth. For exactly in proportion as an artist is certain of his end, will he be swift and simple in his means; and as he is accurate and deep in his knowledge, will he be refined and precise in his touch. The first merit of manipulation, then, is that delicate and ceaseless expression of refined truth which is carried out to the last touch, and shadow of a touch, and which makes every hair's-breadth of importance, and every gradation full of meaning. It is not, properly speaking, execution; but it is the only source of difference between the execution of a commonplace and that of a perfect artist. The lowest draughtsman, if he have spent the same time in handling the brush, may be equal to the highest in the other qualities of execution (in swiftness, simplicity, and decision); but not in truth. It is in the perfection and precision of the instantaneous line that the claim to immortality is laid.