Their permanent presence [of the old traditional paintings out of the past] compels us to produce something different, which is neither better nor worse, but which has to be different because we painted the Isenheim Alter [of Grünewald, 14th century] yesterday.... the better we know tradition – i. e., ourselves and the more responsibly we deal with it, the better things we will make similar, and the better things we will make different.

p. 107, note 60 - 'Doubt and belief in painting' (2003)