The mind, once expanded to the dimensions of larger ideas, never returns to its original size. – Oliver Wendell Holmes

Some minds seem almost to create themselves, springing up under every disadvantage and working their solitary but irresistible way through a thousand obstacles. – Washington Irving, The Sketch Book, 1820

When I feel well and in a good humor, or when I am taking a drive or walking after a good meal, or in the night when I cannot sleep, thoughts crowd into my mind as easily as you could wish. – Wolfgang Amadeus Mozart

According to Madam Pomfrey, thoughts could leave deeper scarring than almost anything else… – J.K. Rowling, “The Second War Begins,” Harry Potter and the Order of the Phoenix