Philosophy is not a doctrine but an activity.
哲学不是一种学说,而是一种活动。
苦难是智慧的学校。
出自汉·桓宽《盐铁论·执务》。土地堆积起来,便成为山峦。水储存起来便会形成江海,品行积累起来便会成为高尚的人。
A theory should not attempt to explain all the facts, because some of the facts are wrong.