Volume Volume1\Intro to the Book on Painting
Entry# 19. Necessity of theoretical knowledge (19. 20).
Contents: Vol. 1 | Vol. 2
OF THE MISTAKES MADE BY THOSE WHO PRACTISE WITHOUT KNOWLEDGE.
Those who are in love with practice without knowledge are like the
sailor who gets into a ship without rudder or compass and who never
can be certain whether he is going. Practice must always be founded
on sound theory, and to this Perspective is the guide and the
gateway; and without this nothing can be done well in the matter of
drawing.