We accumulate our opinions at an age when our understanding is at its weakest.

Even truth needs to be clad in new garments if it is to appeal to a new age.

We cannot remember too often that when we observe nature, and especially the ordering of nature, it is always ourselves alone we are observing.

I cannot say whether things will get better if we change what I can say is they must change if they are to get better.

Never undertake anything for which you wouldn't have the courage to ask the blessings of heaven.