1. He held that a man of learning, if he does not wish to degrade himself, must never cease to participate in public affairs — he must not shut himself up in his study or laboratory and shun the social and political struggles of the day.
    他认为，一个有学问的人，除非他自甘落伍，应该从不停止参加公众活动——他不能把自己关在书房或实验室中，逃避现实社会和政治斗争。

2. You degrade yourself when you tell a lie.
    你撒谎时就贬低了自己。