I want to know the answer to the following question:
According to what, energy can neither be created nor destroyed by itself?
All the background I'm provided with is that "Energy is subject to a strict global conservation law; that is, whenever one measures (or calculates) the total energy of a system of particles whose interactions do not depend explicitly on time, it is found that the total energy of the system always remains constant.". Is that enough to answer the question?
Answer: no