CS Lewis once said “It is a good rule after reading a new book, never to allow yourself another new one till you have read an old one in between.” For a while I thought that by an old book, he meant a previously read book. But in the context, you can clearly see that he is talking about books that were written several years ago and have stood the test of time. They are reliable. The “experts” have had a chance to read and re-read them, have deemed them worthy, and have commended them to others for further reading. Whereas a new book is still in its “trial” run. It may yet stand the test of time. But it is dangerous, or at least unwise, for an amateur to consume too much of the new without the old, lest he be lead astray in his understanding.