We want the mathematical genius - there is work for him. We want the literary genius - there is work for him, especially in my office. We want the scientific brain - there is more than enough work for him. We want the man of brains and we want the man of common sense and little brain. We want the man of initiative and the man of action, the methodical man and even the crank. We open our ranks widely to all.

Speech to the Cambridge University Aeronautical Society, April 1925 in Trenchard, Man of Vision (1962) p. 519