Thought is not essential to existence nor its cause, but it is an instrument for becoming; I become what I see in myself. All that thought suggests to me, I can do; all that thought reveals in me, I can become. This should be man's unshakable faith in himself; because God dwells in him.

                            Sri Aurobindo, Thoughts and Glimpses

     ...Sri Aurobindo declares that thought is not essential to existence, it is not the cause of existence, but is just the process, the instrument of becoming, for thought is a principle of precise formulation which has the power of creating forms. And as an illustration Sri Aurobindo says that all that one thinks one is, one can, by the very fact of that thinking, become. This knowledge of the fact that all that one thinks one can be, is a very important key for the development of the being, and not only from the point of view of the possibilities of the being, but also from that of the control and choice of what one will be, of what one wants to be.
     This makes us understand the necessity of not admitting into ourselves any thought which destroys aspiration or the creation of the truth of our being. It reveals the considerable importance of not allowing what one doesn't want to be or doesn't want to do to formulate itself into thought within the being. Because to think these things is already a beginning of their realisation. From every point of view it is bad to concentrate on what one doesn't want, on what one has to reject, what one refuses to be, for the very fact that the thought is there gives to things one wants to reject a sort of right of existence within oneself. This explains the considerable importance of not letting destructive suggestions, thoughts of ill-will, hatred, destruction enter; for merely to think of them is already to give them a power of realisation. Sri Aurobindo says that thought is not the cause of existence but an intermediary, the instrument which gives form to life, to creation, and the control of this instrument is of foremost importance if one wants disorder and all that is anti-divine to disappear from creation.

     One must not admit bad thoughts into oneself under the pretext that they are merely thoughts. They are tools of execution. And one should not allow them to exist in oneself if one doesn't want them to do their work of destruction.

  The Mother