Any colour - so long as it's black.

The man who has the largest capacity for work and thought is the man who is bound to succeed.

Almost all enduring success comes to people after they are forty. For seldom does mature judgment arrive before then.

It is regrettable that people think about our monetary system, and of our economic structure, only in times of depression.

Anyone who stops learning is old — whether this happens at twenty or at eighty. Anyone who keeps on learning not only remains young but becomes constantly more valuable — regardless of physical capacity.

People are as happy as they choose to be.

Time waste differs from material waste in that there can be no salvage. The easiest of all wastes and the hardest to correct is the waste of time, because wasted time does not litter the floor like wasted material.