I first came across this phrase a couple of years ago when I was watching a Sadhaguru video on Youtube and my daughter was still very small. He spoke of how we cannot expect our children to be a certain way, if we are not, we do not need to direct our efforts of teaching onto our children for them to learn.
 
Our children are like sponges they absorb and take in everything around them, they learn to talk and walk without us physically or directly teaching them. They have picked up how to say goodbye or hello as they have seen us do it so many times.