Don't be too timid and squeamish about your actions. All life is an experiment. The more experiments you make the better.

不要由于羞涩而缩手缩脚。生命就是一场实验。你试验的越多，就做得越好。

youdao

If situations such as Syria make us look too timid about needed intervention, it can be as dangerous and provocative internationally as when tin-pot troublemakers such as Kim Jong Un bang the table and cry for attention.

CNN: Does North Korea think U.S. going soft?