What I wouldn't give to be seventy again!

There are many things which we can afford to forget which it is yet well to learn.

On every stem, on every leaf,... and at the root of everything that grew, was a professional specialist in the shape of grub, caterpillar, aphis, or other expert, whose business it was to devour that particular part.

We are all tattooed in our cradles with the beliefs of our tribe; the record may seem superficial, but it is indelible.

Deep-seated preferences cannot be argued about - you cannot argue a man into liking a glass of beer.

Science is the topography of ignorance. From a few elevated points we triangulate vast spaces, inclosing infinite unknown details. We cast the lead, and draw up a little sand from abysses we may never reach with our dredges.

We have been cocksure of many things that were not so.