Even greatest thinkers in history have troubles with controlling their thoughts they tend to overthink a lot and it’s taking the peace from them. In many cases, thoughts with negative impulses come into their mind and that thoughts swarms and new negative thoughts come. That can be very exhausting and it takes a lot of energy. Overthinking is good in some way the brain is like a muscle if it is under pressure then strengthening is the product of that process. But if it occurs too much then it weakens the health it overloads the system. The brain needs a rest and training equality. If we are lazy in thinking that causes weakening of brain power and strength
It is true that we are not what we think. Thinking is a process of mind which flaws constantly even if we are not thinking in the form of words during the sleep while we dream then we think in the visual form. We run the process of thinking just like the computer processor processes information and running programs.
Body is biological hardware and DNA is ultimate software but Consciousness is the main operator. Body and DNA are under the influence of change but Consciousness is unchangeable and infinite. Consciousness as operator giving commands for every process which is running in DNA and body. We are entire universe experiencing itself in limited editions like living beings.