Thoughts about the Sentence: I Always Remain Relaxed ...

Before we consult the Spiritual Teaching for advice, I will tell you, in brief, what the lexicon has to say about the self. Since I personally do not own an English psychological lexicon, I will quote a passage from the Spiritual Teaching, namely from Spirit-Lesson no. 144, chapter, “Source of Dreams, Consciousness-Conscious/Subconsciousness-Unconscious/Subconscious-Forms”. Billy inserted a lexicon-definition there about the self. I won’t copy it all—it would be far too long—only the first few lines:

Self, a hypothetical construct used in modern psychology in different meanings; the self in this sense does not describe a psychological authority but is an expression of the fact, that the subject itself becomes conscious of itself and at the same time the object of itself, and hence it is also an expression for the continuity of the personality. The term is 1) a name for the system of the conscious and unconscious knowledge of a person about who he believes he is, with respect to the areas of his own body (body-self), or his own actions (action-self), relations (relation-self) and value systems (…) – 2) a name for the coordinated control of these knowledge-processes, also often called 'ego' (as by Sigmund FREUD), etc.

You notice here again, this is but 'beating around the bush' without really explaining anything. The self is obviously a hypothetical construct. Translated into normal language, this means: the self is a constructive idea used to help describe things or characteristics, which are not concretely observable, but merely inferable from what is observed.
The self is certainly not an organ, just as the 'I'/Ego is not; instead, certain impulses/impulsations in a specific frequency range define the self and the 'I'/Ego as well as the other consciousness-block-programs/-processes, otherwise it would be impossible for the overall-consciousness-block to build these in the death-life for the consciousness-block. Furthermore, organs are also 'only' made of impulses, simply in a more compact form.
In the book, “Wiedergeburt, Leben, Sterben, Tod und Trauer” (“Reincarnation, Life, Dying, Death and Mourning”, in German only, FIGU Wassermannzeit-Verlag, CH-8495 Schmidrüti), from page 146 to 148, under the title, “Beschaffenheit des Bewusstseins, der Persönlichkeit und des Ich resp. Ego” (“Structure of the Consciousness, the Personality and the 'I' or Ego”), – or in the corresponding Spirit-Lesson – there is a lengthier discourse from which I intend to quote only a few sentences. I recommend though that you read the entire chapter or – better yet – the entire book again. Billy writes there: