"The best results are achieved by using the right amount of effort in the right place at the right time. And this right amount is usually less than we think we need. In other words, the less unnecessary effort you put into learning, the more successful you'll be... the key to faster learning is to use appropriate effort. Greater effort can exacerbate faulty patterns of action. Doing the wrong thing with more intensity rarely improves the situation. Learning something new often requires us to unlearn something old."
"If you would inform, a positive and dogmatic manner in advancing your sentiments may provoke contradiction and prevent a candid attention. If you wish information and improvement from the knowledge of others, and yet at the same time express yourself as firmly fixed in your present opinions, modest, sensible men, who do not love disputation, will probably leave you undisturbed in the possession of your error."
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