Leonardo da Vinci, 1452-1519
was an Italian engineer, painter, and sculptor
Study without desire spoils the memory, and it retains nothing that it takes in.
Henry Ward Beecher, 1813-1887
was an US abolitionist and clergyman
To become an able and successful man in any profession, three things are necessary, nature, study and practice.
Albert Einstein, 1879-1955
was an US (German-born) physicist
Never regard study as a duty, but as the enviable opportunity to learn to know the liberating influence of beauty in the realm of the spirit for your own personal joy and to the profit of the community to which your later work belongs.