I was very lucky. I was told this almost every day as a child. I was lucky to have hot food, clothes and people who loved me. Others weren't so lucky.
It's strange how, as a child what we're told over and over can do one of two things: create a deep and long-standing belief that what we were told is true, or create disbelief and complete resentment over it, both of which can have equally devastating consequences as an adult.