I will first give the members here an example then ask a generic question.
I was always a jolly teenager. At age 15 and 16 when I was in grades 9 and 10, I decided I will be in the top twenty students' list in my province by giving my all and studying very hard.
So I became very disciplined. I made a schedule that I will wake up at 6 am sharp, eat breakfast and study the whole day and eat lunch and sleep during the afternoon for 25 minutes and wake up by an alarm clock then study again, have supper and then study again and go to bed at 12 am. No TV, no music and no entertainment. No sports also. I did just that for two and a half years.
I forgot about eating. I always thought about studying. Only acquiring education can help me thrive in the future. Only that can save me from an unknown and bleak and shabby and dark uncertainty. So I studied more than an average or any student would do for the same exam.
Then I wrote the exam. After the exam, I was confident that I will get a place. But when I got the result it was a huge shock for me. I was way behind though I memorized the book by heart. I memorized every word. Every letter was at my fingertips. Students cheated at the exam but I believe in honesty so I stayed away from it. Also after the exam, I slept for three months without a break. And when the result came out I was horrified. I couldn't believe my eyes.
At school and in the family, we learn Practice makes perfect. Patience is a great virtue. Slow and steady win the race. Honesty is the best policy. I did all that. I followed those by the book. Like a Bible. Still, my brain could not take the input of vast knowledge, process them and output it properly. In the meantime, I developed multiple in fact six different types of mental illnesses for which I can't forgive myself still. I was diagnosed with them after the result was out and couple of years later after that. I strongly believe the shock from the result was so severe that I developed them. Or I worked so hard that I had a breakdown. Because there is none in my family as far as I know who has mental illnesses. I blame myself because I was over-ambitious. I should have known better that I shouldn't try something that I couldn't do. I shouldn't have gone overboard. I tried too hard. I should have known that there is something in life that can never be achieved for some people no matter how you work hard. At least for me.
Now the generic question. The question is: Is our brain that sensitive that when we set up our mind to do something and we work very hard, in fact extremely hard to achieve the best possible outcome, that impossible undertaking can break the mind for some and silence them forever and can lead to what we call in medical terms a person with mental incoherence? For example if a student puts extreme pressure on his/her brain by studying.