Education never ends, Watson. It is a series of lessons, with the greatest for the last. - Arthur Conan Doyle

Every man finds his limitations, Mr. Holmes, but at least it cures us of the weakness of self-satisfaction.

One night — it was on the twentieth of March, 1888 — I was returning from a journey to a patient(for I had now returned to civil practice), when my way led me through Baker Street. As I passed the well-remembered door...I was seized with a keen desire to see Holmes again, and to know how he was employing his extraordinary powers. His rooms were brilliantly lit, and, even as I looked up, I saw his tall, spare figure pass twice in a dark silhouette against the blind. He was pacing the room swiftly, eagerly, with his head sunk upon his chest and his hands clasped behind him. To me, who knew his every mood and habit, his attitude and manner told their own story. He was at work again. He had risen out of his drug-created dreams and was hot upon the scent of some new problems.

Well,' said our engineer ruefully as we took our seats to return once more to London, 'it has been a pretty business for me! I have lost my thumb and I have lost a fifty-guinea fee, and what have I gained?'
'Experience,' said Holmes, laughing. 'Indirectly it may be of value, you know; you have only to put it into words to gain the reputation of being excellent company for the remainder of your existence.