As surprising it may sound, a foundation of a genuine and a sincere ‘Yes’ is built on a/many ‘No’.
Sorry, I can not attend this meeting.
Well, I don’t think I can go ahead with your proposal.
My apologies, my plate is full right now so I don’t want to take this project up.
I can’t support you on this, my principles are different.
and so on…
Not everything which comes our way is meant for us. Once we learn to prioritize, apply our judgments and take decisions – we learn to say ‘No’ to the right people at the right time. Then our ‘Yes’ will be valued by others. Also, we will value our ‘Yes’ as well. We would become more sincere, planned and committed in our approach and attitude.