Nature tends to produce constancy in all her works, but she does not always succeed.
大自然倾向于在她所有的作品中产生恒常性,但并不总是成功。
I don't let the past hold me hostage.
一如灵魂和理性相互依存。
We should follow whatever seems probable, and avoid whatever seems improbable.
Every great advance in natural knowledge has involved the absolute rejection of authority.  
Any change, even a change for the better, is always accompanied by drawbacks and discomforts.