The nature of work for efficiency. The individual acts for convenience. 
In fact, as an example estremizzante: disastrous decisions for many are the best for the few who hold power. 
Example aside, in nature there is a rule of mutual equilibrium: every living being is part of a cycle in which energy is passed each other. When the balance is broken new life forms are created to rebalance the system. 
The road of convenience does not lead to big results in the long run because it is destined to be overwhelmed by the law of nature. 
The way of the sage, the much-coveted lighting, you can achieve when your convenience coincide with the efficiency determined by nature. 
That is why the test is often referred to in peace and harmony with all other living beings. 
Consequence of this attitude: the happiness, the happiness of the eternal balance. 
A further consequence: this is important because it is the only time that they occur in natural events.