Giorgio Vasari, Lives of the Most Eminent Painters Sculptors and Architects…
“ Luca, then, while passing from one method of work to another, from marble to bronze, and from bronze to clay, did this not by reason of laziness or because he was, as many are, capricious, unstable, and discontented with his art, but because he felt himself drawn by nature to new things and by necessity to an exercise according to his taste, both less fatiguing and more profitable. Wherefore the world and the arts of design became the richer by a new, useful, and most beautiful art, and he gained immortal and everlasting glory and praise. ”
