The term "tabula rasa" is associated with John Locke, who lived in the seventeenth century. In this way, he described the mind of a newborn human, a little tiny baby, who is leaving the cosy place, and enter to the world full of wolves. The baby's mind starts to learn how to survive in the new environment.
However, I have a different idea than this "tabula rasa" thing. In my opinion, nobody is born as a saint, because we are born as self-centred creatures (saints are not selfish), and with the years as we are getting life experience, we learn how to be more sociable, we adapt to live in the herd.