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把舵的不慌乘船的稳当 is a Chinese proverb that literally translates as: [If the] helmsman is not nervous, the passengers [will feel] secure.
Figuratively, this means: If the leader appears confident, his/her followers will gain confidence also.
This is a great suggestion that a confident leader inspires confidence in his/her troops or followers. Of course, a nervous leader will create fear in troops or followers.