The first test of a truly great man is his humility. By humility I don't mean doubt of his powers or hesitation in speaking his opinion, but merely an understanding of the relationship of what he can say and what he can do.
John RuskinThe work of science is to substitute facts for appearances, and demonstrations for impressions.
John RuskinIf some people really see angels where others see only empty space, let them paint the angels: only let not anybody else think they can paint an angel too, on any calculated principles of the angelic.
John Ruskin