how to say 不呜则已，一鸣惊人 in English?

不呜则已，一鸣惊人 = when a bird need not cry, it doesn’t; once it does, it will startle everyone

不呜则已，一鸣惊人这话英语怎么说

不呜则已，一鸣惊人 = when a bird need not cry, it doesn’t; once it does, it will startle everyone