"As every divided kingdom falls, so every mind divided between many studies confounds and saps itself"

This quote by Leonardo da Vinci speaks with the value of focus and commitment. He is recommending that when a kingdom is divided, it is deteriorated and eventually falls. Likewise, when a person's mind is divided between lots of studies, it can become overloaded and confused, leading to a lack of progress and eventually a weakening of the individual. This is a tip to concentrate on one thing at a time and to commit yourself to it fully. By doing so, you can avoid the confusion and absence of progress that comes with attempting to do too many things simultaneously. It is necessary to bear in mind that when we concentrate on one thing, we can achieve more and be more effective.