The changes of thought have indeed been very great, but the moral experience of mankind remains exactly as valuable as it was before, and new perceptions of that value have been given to us by the new philosophy.
It has been wisely observed by the greatest of modern thinkers that mankind has progressed more rapidly in every other respect than in morality.

Moral progress has not been rapid simply because the moral ideal has always been kept a little in advance of the humanly possible.
Thousands of years ago the principles of morality were exactly the same as those which rule our lives to-day.

We can not improve upon them; we can not even improve upon the language which expressed them.

The most learned of our poets could not make a more beautiful prayer than the prayer which Egyptian mothers taught to their little children in ages when all Europe was still a land of savages.

The best of the moral philosophy of the nineteenth century is very little of improvement upon the moral philosophy of ancient India or China.