My First Thought is Probably Not My Best

In principle, my initial reaction, my first thought, is very rarely my best. Often my first thought is absurd and shows me how NOT to react. Like first brush strokes on a canvas, first thoughts provide a starting place for more refined thoughts, for subsequent brush strokes. First thoughts, like initial brush strokes, are rarely worth sharing. In fact, sharing first thoughts can be deeply counter-productive to good group decisions.
Practical Tip: Just because you think something doesn't mean you have to say it, or act on it. When you share first thoughts you run a substantial risk of offending others, saying things you will regret, and requiring the group to spend time on issues which turn out to be a waste of time. Best to sit with your thoughts until a clear picture emerges of what you want to say.