People who understand themselves and are clear about their strengths and weaknesses are bound to make sound decisions and display fortitude.  

Mentally strong people are aware of their emotions and know how to control them when required. They are also capable of understanding others' emotions and being empathetic. 

Mentally strong people are optimistic about their plans. They know the importance of setting achievable goals and keeping a positive mindset. 

Mentally intelligent and strong people are problem solvers. They do not let anything get in their way and always find the best constructive solution rather than dwell in trouble. 

No matter what setbacks they face, mentally strong people rise above and fight with determination and endurance to achieve their goals. 

Mental strength is determined by self-discipline, the ability to focus on goals instead of getting distracted, and being able to regulate thoughts and emotions.