Yesterday's success formula is often today's obsolete dogma ... We must continually challenge the past so that we can renew ourselves each day.
We are now at a point where we must educate our children in what no one knew yesterday, and prepare our schools for what no one knows yet.
A man should never be ashamed to own he has been in the wrong, which is but saying, in other words, that he is wiser to-day than he was yesterday.
Yesterday is gone. Tomorrow has not yet come. We have only today. Let us begin.