“There is nothing more dreadful than the habit of doubt. Doubt separates people. It is a poison that disintegrates friendships and breaks up pleasant relations. It is a thorn that irritates and hurts; it is a sword that kills.”
Other Buddha Quotes
Holding on to anger is like grasping a hot coal with the intent of throwing it at someone else; you are the one who gets burned.
Buddha 
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An insincere and evil friend is more to be feared than a wild beast; a wild beast may wound your body, but an evil friend will wound your mind.
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Do not dwell in the past, do not dream of the future, concentrate the mind on the present moment.
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