Questions uncover intent vs commitment. The purpose is to focus on communication and gather data. If you truly wish to understand people, you must listen more that you speak.
Listening is a skill which is hard to master and requires one to be able to distinguish between what is being said vs. what is not being said. We should be constantly striving for clarity and not accept vagueness. Having good skills in this area will help you minimize the risk you will say something you might later regret.
Even though questioning is a big part of the sales process unless you can reflectively listen, synthesise what is being said (and not said) and accurately summarise what has transpired, you will potentially miss the real issues.
Establishing rules is not a hard process, but consistency in its implementation is.
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