From Book V1-P153 March 28, 1974

Many thoughts are generated by the false illusion and those thoughts should be immediately rejected.
It’s an opportunity to be within the illusion and then through the generation of understanding overcome the potentials of the illusion. This is a way of gaining progress spiritually.
Keep uppermost in your mind that the illusion that you experience is an illusion, and that it’s surrounding you for the purpose of teaching you.
V1 P11
Maturity is in truth a maturity of the spirit.
Maturity is the ability to control one’s own consciousness.
It’s necessary to reject those thoughts that continually infringe upon your mind from your environment (because there are lots of immature people and incorrect assumptions or misinformation in this environment )
It’s necessary to carefully to select each thought you generate to reach a state of true mental maturity.
If the thought can help you or someone you communicate to develop consciousness, then it is a thought of value, or a worthwhile thought.
Analyze the merit of your thoughts. If it’s a thought of consequence, use it, amplify it and communicate it. Otherwise, it will be of little value.
There’s only one way to reach real maturity, that’s through meditation.
Lack of meditation reduces this boundary to an impermeable state.
Once the art of meditation has been fully mastered, the intellectual mind becomes a useful tool in the development of the spirit.
Meditation not only breaks down the barrier between the intellect and the spirit, but also breaks down all other barriers between the spirit and the one great ALL.
Comments:
Maturity is a term we all know but seldom define. Before this reading, I would generally think of maturity as being wiser or being able to think or do things effectively, which has nothing to do with spiritual development. (The definition I can find online is relatively advanced physically, mentally, emotionally, etc; grown-up ) When one thinks deep into it, this is based on a physical world as we know it. In this physical world, spiritual development is being put to the very least or even greatly doubt. This is a good example of how the culture and media influence one’s value system and one’s mind. These beings take the definition to a whole refined level based on spirit and consciousness.
If we all know that the physical world as we know it doesn’t exist, and time doesn’t exist, eventually all we have is spirit, our soul/light, how much would we change our priorities/value system?
Thus, in truth, all we can work on and develop is actually spiritual development. Nothing else is that important.
