A drawing is simply a line going for a walk.

Drawing is like making an expressive gesture with the advantage of permanence.
Drawing is putting a line (a)round an idea.
The best drawings are the ones where there is no line.

Sketching is almost everything. It is the painter's identity, his style, his conviction, and then color is just a gift to the drawing.
Sketching is the breath of art: it is the most refreshing of all the more impulsive forms of creative expression, where an idea is first born.
To sketch is to breathe, to be free.

To draw, you must close your eyes and sing.

A sketch is a quickly executed freehand drawing that is not intended as a finished work.