In nutshell, a change in thought totally changes person or personality. Or a change of mentality makes changes in person and in personality. It is not much related to hereditary. Not only the life of A.P.J but the lives of many other great people are examples for this fact. We can see this truth in Bible from the words of John the Baptist. Look, Mathew, chapter three verses 7-9,
“7 But when he saw many of the Pharisees and Sadducees coming to his baptism, he said to them, “You brood of vipers! Who warned you to flee from the wrath to come? 8 Bear fruit in keeping with repentance. 9 And do not presume to say to yourselves, ‘We have Abraham as our father,’ for I tell you, God is able from these stones to raise up children for Abraham”.
Here John the Baptist says “Bear fruit in keeping with repentance”. This denotes the required mental change, or change in the thought, and thereby the qualities and deeds needed to make changes in personality. Abraham was one of the great prophets and he made great achievements with his faith. But those who were the descendants claimed the heritage of him didn’t have that ability and quality. That’s why John warned them. So what we are is our own product. Otherwise, anybody can make changes by making changes in their mental activities, faith, and beliefs.
Sometimes we try to make changes in persons but results in failure. Then we blame the hereditary. Actually, some other thoughts must have a greater influence on the person than the thought we tried to impart. We never think about that side. What a person is his present stable thoughts. So excavate the mind to reveal the present personality. Only after knowing the present thoughts or mental state, we can make required amendments to the existing and plant new thoughts. In another version of this statement we can retell this truth like this, “until and unless a person is very open, it is very difficult to make any change in that person or personality.” Again, an open minded man can always make tremendous changes in his life. But “where and why the man is open” determines the direction and magnitude of change of that man.