"Thought Leads to Knowledge"
We cannot gain knowledge merely by reading. The value of reading is in the thought that it stimulates in the mind. We exercise muscles to get strength. You must aid the child in exercising his mental muscles by thinking in order to get mental strength. It is not what he reads, but what he thinks concerning what he reads that becomes his, and contributes to his education. Reading which stimulates no thought is a waste of time.
The disappointment felt in the lack of progress after time spent in study is not that we forget, but that we do not really "GET." This lack can be largely avoided in the child's training if you are willing to help in forming right habits.