[after they have restrained the Dormouse]"Mad Hatter: Ah thank goodness! Those are the things that upset me!
March Hare: See all the trouble you started?
Alice: But I didn't think...
March Hare: Ah, that's just it. If you don't think, then you shouldn't talk. "
Text taken from: Imdb.com
Quoted from the script
How many times have you heard the phrase, think before you speak? Well even the Mad March Hare says it in the classic Alice in Wonderland. Most people don't think but always seem to be talking. Maybe they never watched the March Hare, but he could have given them some really good advice.