It is incumbent on every person to act according to the laws of nature when concerning his health and livelihood. However, our eyes see that many did this and were unsuccessful, even though they did everything possible according to the laws of nature, and were very careful about their health, and tried hard to make a profit in all sorts of investments and jobs, and in the end remains with nothing. From seeing this a person is obligated to believe and remember what the Torah says, “And you must remember that it is He (Hashem) who gives you the energy to be victorious”. And every natural thing that happens to a person, good or bad, is all decreed by the Exalted G-d based on the actions of that person. If, on the other hand, a person left the fold and did something which by the laws of nature would cause him harm, even if in heaven it was already decreed that this thing would happen to him, he will nevertheless be punished, and must give account for all that he did which is not correct.
כ״ט במרחשון ה׳תשפ״א
My brother and my nation, take this Torah book, in this and like this learn well, listen and revival your soul, you will achieve joy and joy, in this world and next world. (from introduction of the author) 1