If I stay alert, then I can challenge myself, and by challenging myself, that helps me to stay alive and to hopefully take something away from the experience.
I believe that in the end the abolition of war, the maintenance of world peace, the adjustment of international questions by pacific means will come through the force of public opinion, which controls nations and peoples.
If it takes you 20 or 25 years to establish yourself in one field, you really ought to be careful not to stray too far.