Yesterday, we sought telescopes good enough to see all the planets. Today, we seek vehicles good enough to reach them.

Tomorrow isn't better than today ~ yet.

Today's accomplishments were yesterday's impossibilities.

Yesterday, we fought wars which destroyed cities. Today, we are concerned with avoiding a war which will destroy the earth. We can adapt atomic energy to produce electricity and move ships, but can we control its use in anger?

It is not enough to understand, or to see clearly. The future will be shaped in the arena of human activity, by those willing to commit their minds and their bodies to the task.

Now that it's all over, what did you really do yesterday that's worth mentioning?