In the actual world， a very great deal of the evil that is done does not spring from evil motives.

Failure is an option here. If things are not failing, you are not innovating enough.

To be an artist you have to give up everything, including the desire to be a good artist.

The mathematician's best work is art, a high perfect art, as daring as the most secret dreams of imagination, clear and limpid.

发出履行性陈述并不是在做陈述，因此履行性陈述的发言既不真实也不虚假。