Is the effort in direct proportion to the gain?

Like the content of ohm's law: the current in a conductor is directly proportional to the voltage at both ends of the conductor and inversely proportional to the resistance of the conductor; Pay is in direct proportion to gain, that is to say, the more you pay, the more you gain. On the construction site, if you work hard, you will reap more hard-earned money. In life, if you pay a sincere attitude, you will gain more sincere friendship. The more you pay, the more you get, just like more work and less. If you don't pay, there will be no return, and the pay is directly proportional to the gain. For example, Li Shizhen spent 27 years consulting more than 800 kinds of books, and finally wrote the world-famous Compendium of Materia Medica. It has made great contributions to the development of medicine in China. Marx, the great revolutionary mentor, spent 40 years of hard work to write the masterpiece Capital. Liu Yiting paid more efforts and diligence than others, and paid more time and energy to study than others. She gained joy and success, which is the so-called "no pains, no gains", that is, no pains, no gains. This is the eternal truth. In the study, as long as you pay more time to study, more energy to study and more efforts to study, you will get the joy of harvest and the satisfaction of success. I believe that paying will be rewarded, and if you want to gain, you must pay, and paying is directly proportional to the gain!