Just because someone forgives your wrongs does not mean their hurt is healed forever.

Whatever words we utter should be chosen with care for people will hear them and be influenced by them for good or ill.

It is not once nor twice but times without number that the same ideas make their appearance in the world.

The pessimist sees difficulty in every opportunity. The optimist sees the opportunity in every difficulty.  

For good or for ill, air mastery is today the supreme expression of military power and fleets and armies, however vital and important, must accept a subordinate rank. 

Do not worry about your difficulties in Mathematics. I can assure you mine are still greater.

Those who educate children well are more to be honored than they who produce them; for these only gave them life, those the art of living well.

If we open a quarrel between past and present, we shall find that we have lost the future. 

Give me six hours to chop down a tree and I will spend the first four sharpening the axe.

No culture can live if it attempts to be exclusive.

The three great essentials to achieve anything worth while are: Hard work, Stick-to-itiveness, and Common sense. 

The over-all point is that new technology will not necessarily replace old technology, but it will date it. By definition. Eventually, it will replace it. But it's like people who had black-and-white TVs when color came out. They eventually decided whether or not the new technology was worth the investment.