In any profession, you will be respected if you are good at your job – not because you are good at talking about your beliefs. It may be quite irrational, but the fact is that, if you are recognized as being outstanding on one thing, you will be listened to on all sorts of subjects in no way related to it... and so, if you are going to be really effective [for your cause] in your place of work, you must set out to be the best man at your job.
Douglas Arnold Hyde, Dedication and Leadership
credibility, effectiveness, excellence, persuasion