How can you tread the path of Truth unless you step out of the boundary of your own nature?
Baba expounded:
This Path is full of untold and intolerable hardships and sufferings. Even the yogis and saints have not fathomed the state of my Reality. Hafiz speaks of "stepping out of the boundary of our nature." But what is that nature of ours? I am not going to repeat the theme of evolution of forms and consciousness now. I have explained much about these in books. We start with the birth of a human child, for example. The birth is due to his or her past karmas. No sooner is the child born than he or she begins to experience the sanskaras acquired in his or her past lives. So what will be the nature of the child? The nature of the child will be, of course, according to his or her past sanskaras. That child must act, feel and think according to his or her sanskaras accumulated in his or her past lives. There is no way out and he or she must experience the sanskaras. That is the Law of Must.
In addition to this inexorable principle of must, the environmental circumstances are such that they help the child to act, feel and think according to his or her past sanskaras. No sooner does the child see the light of Earth than he or she begins to grow older day by day. He or she must weep as soon as he or she is born. He or she must be given a milk diet. He or she must grow bigger and bigger. He or she must have a name. His or her sex, [character, personality, inclinations], et cetera, is determined by the principle of must. The child knows not from whence he or she has come. The child has no thought of all that. The child takes for granted that he or she is born, and the child begins to live. The child has a sex and a name; he or she cries, eats, drinks, and later studies in school and enjoys or suffers life — all this because of his or her nature — not "Nature [environment]."
Hafiz refers to the nature of a child. This is the Law of Must. It is your very nature, created and nurtured by you, that makes you think that you are a man or a woman, that you have a body, sickly or healthy, beautiful or ugly. It makes you think that you are hungry, robust, unwell, et cetera.