His theoretical writings, apart from his report on the tiburio of the Milan cathedral, have all been lost, but their subjects are indicative of his interests; e.g., works on perspective, on the “German manner” (i.e., on Gothic architecture), on fortification methods, and others.

Bramante seems to have been an extravert. He was said to be very friendly to persons with talent, and he did much to help them. Humour, irony, a taste for intelligent jokes, and mockery of himself as well as others often appear in his sonnets. Full of faith in himself, he was an irreverent person who took pleasure in proposing paradoxical ideas. He was critical of priests and courtiers but also capable of deep religious feeling. In the treacherous atmosphere of courts, he was able to maneuver skillfully. He must have been highly ambitious and not overscrupulous when it came to securing an important commission. His biographers emphasize his impatience and speed in the conception and conduct of his work (Vasari calls him a “resolute, rapid, and excellent inventor”). This quality was combined with imaginative genius and an artful and lively curiosity. His insatiable thirst for experiment and for new knowledge forced him, as Bramante himself remarks in one of his sonnets, to “change himself” continually (“as time changes in a moment / my thought, its follower, changes too”). This trait of instability and inconstancy seems to have led him away from convention in his works to a multiplicity of attitudes and expressions.