Thought is so cunning, so clever, that it distorts everything for its own convenience. Thought in its demand for pleasure brings its own bondage. Thought is the breeder of duality in all our relationships: there is violence in us which gives us pleasure but there is also the desire for peace, the desire to be kind and gentle. This is what is going on all the time in all our lives. Thought not only breeds this duality in us, this contradiction, but it also accumulates the innumerable memories we have had of pleasure and pain, and from these memories it is reborn. 
Jiddu Kirishnamurti