"The key to wisdom is this - constant and frequent questioning, for by doubting we are led to question and by questioning we arrive at the truth"

"Questions are never indiscreet, answers sometimes are"

"Question everything. Learn something. Answer nothing"

"On every thorn, delightful wisdom grows, In every rill a sweet instruction flows"

"Raising children is an incredibly hard and risky business in which no cumulative wisdom is gained: each generation repeats the mistakes the previous one made"

"The man who makes everything that leads to happiness depends upon himself, and not upon other men, has adopted the very best plan for living happily. This is the man of moderation, the man of manly character and of wisdom"

"Youth is not a question of years: one is young or old from birth"

"Nature and wisdom never are at strife"

"The question is not, "Can they reason?" nor, "Can they talk?" but rather, "Can they suffer?""

"Silence does not always mark wisdom"

"Do not waste your time on Social Questions. What is the matter with the poor is Poverty; what is the matter with the rich is Uselessness"