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There are periods in history when change is necessary, and other periods when it is better to keep everything for the time as it is. The art of life is to be in the rhythm of your age.

In one century, we've added 28 years to our average life span - a change so rapid that our brains couldn't possibly have evolved to accommodate it.

If you represent the Earth's lifetime by a single year, say from January when it was made to December, the 21st-century would be a quarter of a second in June - a tiny fraction of the year. But even in this concertinaed cosmic perspective, our century is very, very special: the first when humans can change themselves and their home planet.

Planet Earth is estimated to have a lifetime of nine billion years. And we're right smack in the middle of our lifetime. We've been in the universe for 4.5 billion years. So, that should mean something. We should sort of take a look at where we came from and where we are going.

From the standpoint of observation, then, we must regard it as a highly probable hypothesis that the beginnings of the mental life date from as far back as the beginnings of life at large.

Whether the earth was created in seven days or seven actual eras, I'm not sure we'll ever be able to answer that. It's one of the great mysteries.

There are years that ask questions and years that answer.

I don't worry whether the period is contemporary or three hundred years ago. Human beings are all alike.

Begin at once to live, and count each separate day as a separate life.