Wisdom will get in anyhow

from Oliver Wendell Holmes, Sr., The Poet at the Breakfast Table (1872):

I tell you what,—he said,—there’s so much intelligence about nowadays in books and newspapers and talk that it’s mighty hard to write without getting something or other worth listening to into your essay or your volume. The foolishest book is a kind of leaky boat on a sea of wisdom; some of the wisdom will get in anyhow. Every now and then I find something in my book that seems so good to me, I can’t help thinking it must have leaked in. I suppose other people discover that it came through a leak, full as soon as I do. You must write a book or two to find out how much and how little you know and have to say. Then you must read some notices of it by somebody that loves you and one or two by somebody that hates you. You’ll find yourself a very odd piece of property after you’ve been through these experiences. They’re trying to the constitution; I’m always glad to hear that a friend is as well as can be expected after he’s had a book.