We know nothing to be certainly good or evil save what is truly conducive to understanding or what prevents us from understanding.
We know nothing to be certainly good or evil save what is truly conducive to understanding or what prevents us from understanding.
Prop. XXVII. We know nothing to be certainly good or evil save what is truly conducive to understanding or what prevents us from understanding. (Spinoza, Ethics, p159)
http://www.spaceandmotion.com/Philosophy-Spinoza-Philosopher.htm