How does one know himself or herself?

This question is such a question that it is a question related to the person's point of view, his purpose in life and what he wants to be, so it varies from person to person. The answer to this question for me; it is absolutely "never". If I explain it as an example, think of a person who was born with a very natural ability to play tennis, but unfortunately he has never been on the tennis court before, for example, he could not discover this aspect and probably will not discover many other talents, because we have limited time, on the other hand, people do not discover themselves. there will be "endless things" that he can use as a mediator. If I prove mathematically;

number = is your life here,

(number / infinite = 0), which is the answer to the question for me.