It would be a coincidence if the link that can be most easily strengthened turned out to be the weakest link.
--Seth Roberts, Online Teaching vs. What?, which also makes the point that the best books on a subject are rarely if ever textbooks
Most improvement mechanisms have diminishing returns.
Once again, here's the new thread for posting quotes, with the usual rules:
Please post all quotes separately, so that they can be voted up/down separately. (If they are strongly related, reply to your own comments. If strongly ordered, then go ahead and post them together.)