The only source of knowledge is experience.
Science will stagnate if it is made to serve practical goals.
One must shy away from questionable undertakings, even when they bear a high-sounding name.
The mind that opens to a new idea never returns to its original size
I know that the most joy in my life has come to me from my violin.
New frameworks are like climbing a mountain - the larger view encompasses rather than rejects the more restricted view.