This quote by Leonardo da Vinci speaks to the value of nerve and fear in life. Courage is a trait that can be both useful and harmful, as it can lead to terrific accomplishments, however also put one in harm's way. Fear, on the other hand, can be viewed as a protective force, as it can assist one to prevent harmful circumstances. In this method, nerve and worry can be seen as two sides of the very same coin, both essential for a successful life. Guts can assist one to take risks and accomplish great things, while fear can help one to stay safe and secure their life. Both guts and fear are important for a balanced life, and both ought to be embraced in order to live a full and significant life.
"Life is life - whether in a cat, or dog or man. There is no difference there between a cat or a man. The idea of difference is a human conception for man's own advantage"