ok. Think it through. Think about the conditions that make this kind of exercise a good idea.
Children receive messaging of value from all around them. TV, Youtube, teachers, parents, and especially peers as well as their own self-talk.
Self-talk begins as soon as a child can formulate a realization that they are not the same as those around them, which starts around 18 months of age and the realization grows over time, often in common stages.
What conditions might make this kind of exercise a good idea despite that IDEALLY it should not be a necessity?