If you're ready to spread the most insecure, vague and ambiguous of your thoughts in front of someone without any fear of being judged, ridiculed or rejected, it is likely that this person will also bring the best out of you.
Some wise people pointed out to me that it could, however, cost the relationship in some cases - if the person listening is not ready to accept your thoughts or the fact that they came from you or if the relationship is still nascent for him/her to understand you fully. The second point made was that there may be a difference in the way the person listening reacts if he/she is a strong stakeholder and thus takes things personally or is afraid of being affected.
Anthony De Mello - "People mistakenly assume that their thinking is done by their head. It is actually done by the heart which first dictates the conclusion, then commands the head to provide the reasoning that will defend it."
Recently witnessed how a person with great intentions & high result-orientation can still commit blunders because of getting carried away