The Thinking Mind is made of thoughts
Although the brain is made of billions of nerve connections the experience of our Thinking Mind is made of thoughts - AND THOUGHTS CAN BE CHANGED.
To begin with, changing our habitual thinking patterns is difficult, but by simple practices such as "Applying the opposite thought" to the ones that are disturbing us, then we can make some progress. As we practice changing habits, purifying our mind, applying the opposite thoughts, and learning to entertain thoughts in our mind, then we begin to be able to CHOOSE THE THOUGHTS that make up our mind - and that is a beautiful thing to master, it brings happiness, and is well worth the steady and gradual practice of achieving.
DAILY, STEADY, GRADUAL PRACTICE
If we attempt perfection in one day then we won't achieve much of anything. Learning to become THE MASTER OF OUR MINDS takes time and daily practice, but it is well worth the effort - can there be any greater thing to do than this?
Your natural intelligence
Unless you have some form of brain damage, then all healthy individuals have a natural intelligence that is hard-wired into your body. This natural intelligence has nothing to do with accumulating knowledge, but it can be enhanced by such studies. This natural intelligence is part of your soul and it has everything you need to live your daily life and to also wonder, enquire, and understand all that surrounds you in this world and the next.
Being able to study and remember academic studies when we are school is not a true reflection of our natural intelligence. The method of schooling often does not work for the majority of people. If the school system wasn't right for you, don't misbelieve that you are not intelligent and don't be put off reading, thinking, enquiry, wonder, and study. This world is full of wonder and wonderful books, films, etc... to help us look beneath the surface, and your natural intelligence is capable of understanding a great deal of it.
Enjoy your natural intelligence.