"This was what Bertrand Russell called his 'Ten Commandments' as a teacher.

1. Do not feel absolutely certain of anything.
2. Do not think it worthwhile to proceed by concealing evidence, for the evidence is sure to come to light.
3. Never try to discourage thinking for you are sure to succeed.
4. When you meet opposition, even if it should come from your husband, wife or children, endeavor to overcome it by argument and not by authority- for victory dependent upon authority is unreal and illusory.
5. Have no respect for the authority of others, for there are contrary authorities to be found.
6. Do not use power to suppress opinion you think pernicious, for if you do the opinions will suppress you.
7. Do not fear to be eccentric in opinion, for every opinion now accepted was once eccentric.
8. Find more pleasure in intelligent dissent than in passive agreement, for, if you value intelligence, as you should, the former implies a deeper argument than the latter.
9. Be scrupulously truthful, even if the truth is inconvenient, for it is more inconvenient when you try to conceal it.
10. Do not feel envious of the happiness of those who live in a fool's paradise, for only a fool will think that it is happiness."