The only real knowledge is self-knowledge.
译文:西风落日下野草斑驳,秋日天空云淡风轻,一只孤鸟飞过。我这个两鬓斑白的游子,又骑着马登上了太行山。
The concept of progress is inseparable from the concept of catastrophe.
"The past is always present in the present."