Only continuous learning can keep us invincible in fierce competition.
The pain you feel today will be the strength you feel tomorrow.
I do not know what I may appear to the world， but to myself I seem to have been only like a boy playing on the sea-shore， and diverting myself in now and then finding a smoother pebble or a prettier shell than ordinary， whilst the great ocean of truth lay all undiscovered before me.
实现明天的唯一限制是我们今天的疑虑。