All progress is precarious, and the solution of one problem brings us face to face with another problem.

Is it progress if a cannibal uses knife and fork?

Human progress is furthered, not by conformity, but by aberration.

Progress-progress is the dirtiest word in the language-who ever told us- And made us believe it-that to take a step forward was necessarily, was always A good idea?

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

The magnitude of a "progress" is gauged by the greatness of the sacrifice that it requires.

All history teaches us that these questions that we think the pressing ones will be transmuted before they are answered, that they will be replaced by others, and that the very process of discovery will shatter the concepts that we today use to describe our puzzlement.

Every step of progress the world has made has been from scaffold to scaffold, and from stake to stake.

It was old President Diaz who said that nothing ever happens in Mexico until it happens. Things rock along from day to day, and then all at once you are caught up in a rush of unforeseen events.

The desire to understand the world and the desire to reform it are the two great engines of progress, without which human society would stand still or retrogress.