Beverly: Data, telling us why you are going to fail before you make the attempt is never wise.
Data: But... is not honesty always the preferred choice?
Picard: Excessive honesty can be disastrous, particularly in a commander.
Picard: Knowing your own limitations is one thing. Advertising them to a crew can damage your credibility as a leader.
Data: Because you will lose their confidence.
Beverly: And you may begin to believe in those limitations yourself.