Improving yourself is a lot more profitable than trying to improve others.

Each party should gain from the negotiation.

An effective speaker knows that the success or failure of his talk is not for him to decide - it will be decided in the minds and hearts of his hearers.

Be a good listener. Encourage others to talk about themselves.

One can win the attention and time and cooperation of even the most sought-after people by becoming genuinely interested in them.

Make a man laugh a good hearty laugh, and you've paved the way for friendship. When a man laughs with you, he, to some extent, likes you.

The best argument is that which seems merely an explanation.