A man or a mouse is a proverbial expression to express risk or encourage a person to be daring
A man is anyone who has developed virtues like perseverance, persistence and tenacity.
A man is known for his willpower.
A man can also be referred to as a personality
A man can only be measured by the level of the development in his soul (mind, will and emotion)
On the contrary, a mouse is so scared, weak willed and easily throws in the towel at any slight challenge or obstacle
A mouse is a Biomass who is just existing.
They lack the willpower and persistence to pull through difficulties and leverage on challenges.
Only 3% of people living are actually "Personalities" (which also can represent Man) while 97% of people are mere Biomasses (which represents Mouse).
You will see the ways to strengthen and develop your own will, build qualities that would transform you from being a mouse, a biomass to becoming a man, a personality