Don't worry that children never listen to you; worry that they are always watching you.

Knowing is not enough; we must apply. Willing is not enough; we must do.

The delight of opening a new pursuit, or a new course of reading, imparts the vivacity and novelty of youth even to old age.

The schools ain't what they used to be and never was.

The only good is knowledge and the only evil is ignorance.

I have just three things to teach: simplicity, patience, compassion. These three are your greatest treasures.

What we know is a drop, what we don't know is an ocean.

If you can't explain it simply, you don't understand it well enough.

They say a little knowledge is a dangerous thing, but it's not one half so bad as a lot of ignorance.

The reading of all good books is like conversation with the finest men of past centuries.

You can never be overdressed or overeducated.

Civilization is a race between disaster and education.

Men are born ignorant, not stupid. They are made stupid by education.

To every action there is always an equal and opposite or contrary, reaction

Investigate, educate and organize the country must progress, productive works and industries are the main avenues at present next to education for the advancement of the country

Physics is like sex: sure, it may give some practical results, but that's not why we do it.

I like poems you can tack all over with a hammer and there are no hollow places.

It is possible to fly without motors, but not without knowledge and skill.

Books! I dunno if I ever told you this, but books are the greatest gift one person can give another.

Necessity is the mother of invention.

A spirit of national masochism prevails, encouraged by an effete corps of impudent snobs who characterize themselves as intellectuals.