不一定要比别人强，但要比过去的自己强。
It's not always necessary to be better than everyone else, but to be better than you used to be.
The spread of liberal democracy around the world is not inevitable, but it is the most likely outcome given the alternatives.
你为某事付出的努力越多，当你实现它时感觉就越好。
The key to sustainable agriculture is innovation and respect for nature.
Man is by nature a reasonable being, but animals, other than man, are by nature instruments of brute force.