One must change one's tactics every ten years if one wishes to maintain one's superiority

We don't ask you to believe in our ability to bring change, rather, we ask you to believe in yours.

We cannot remain consistent with the world save by growing inconsistent with our past selves.

There is something in the pang of change More than the heart can bear, Unhappiness remembering happiness.

Through loyalty to the past, our mind refuses to realize that tomorrow's joy is possible only if today's makes way for it; that each wave owes the beauty of its line only to the withdrawal of the preceding one.

Progress is a nice word. But change is its motivator. And change has its enemies.

The greatest of the changes that science has brought is the acuity of change; the greatest novelty the extent of novelty.

Time, in the turning-over of days, works change for better or worse.

It's the most unhappy people who most fear change.

Progress is impossible without change, and those who cannot change their minds cannot change anything.