Today's progress was yesterday's plan.

Progress is not an illusion, it happens, but it is slow and invariably disappointing.

We have not wings we cannot soar; but, we have feet to scale and climb, by slow degrees, by more and more, the cloudy summits of our time.

Be not afraid of going slowly, be afraid only of standing still.

A radical is one of whom people say ''He goes too far.'' A conservative, on the other hand, is one who ''doesn't go far enough.'' Then there is the reactionary, ''one who doesn't go at all.'' All these terms are more or less objectionable, wherefore we have

Whatever there be of progress in life comes not through adaptation but through daring, through obeying the blind urge.

I'm a slow walker, but I never walk back.

New roads; new ruts.

The walking of Man is falling forwards.

Only mediocrities progress. An artist revolves in a cycle of masterpieces, the first of which is no less perfect than the last.