Lionel Henry Cust, Dictionary of National Biography… (1899)
“ Rubens is, without any ground, said to have been jealous of Van Dyck, and to have advised him to confine his art to portraits and animals. This advice, if really given, would be nothing more than the advice of a master, whose knowledge of his art was supreme, to a pupil, whose future was uncertain, and who seemed likely to devote himself to a branch of art in which, if sure to succeed, he was not likely to excel, rather than follow out the true bent of his genius. ”
