It is a slogan
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Polonius is using his daughter to spy her conversation with Hamlet. He teaches how to act naturally, how to walk and pretend that she is reading.
In that last phrase, he is saying that we humans often act in deceitful ways, for which we are to blame.
He admits that he is making a mistake, in teaching that kind of behaviour to his own daughter.
Way one they can occasionally ask how the child is feeling but don't force them to answer.
Way two if they child is moping around sad just ask them if they are alright and give them a hug then back slowly back away giving them a moment to say anything that they want to say and if they don't want to just leave them alone.
Way three if the child is angry give them a minute to leave the room and calm down then calmly ask them what the problem is.
<u><em>I know thats only three im sorry i just can't think of another one i hope everything goes good and im sorry if these didnt help i wish you the best luck with whatever your doing. </em></u>