In the ever increasing quest for competence and adaptability to a myriad of fields life has to offer, there is a tendency to begin to amass data/information of all sort and thus become a Jack of many trades and master of none. I found this extensive quote attributed to Sherlock Holmes by Arthur Conan Doyle profound:
“I consider that a man’s brain originally is like a little empty attic, and you have to stock it with such furniture as you choose. A fool takes in all the lumber of every sort that he comes across, so that the knowledge which might be useful to him gets crowded out, or at best is jumbled up with a lot of other things, so that he has a difficulty in laying his hands upon it. Now the skillful workman is very careful indeed as to what he takes into his brain-attic. He will have nothing but the tools which may help him in doing his work, but of these he has a large assortment, and all in the most perfect order. It is a mistake to think that that little room has elastic walls and can distend to any extent. There comes a time when for every addition of knowledge you forget something that you knew before. It is of the highest importance, therefore, not to have useless facts elbowing out the useful ones.”
― Arthur Conan Doyle, A Study in Scarlet
In the end, the elastic limit of the brain is the extent to which it can gather knowledge, arrange the info gathered systematically, and then function at the highest level possible.