We are more inclined to read the details when we are young, for several reasons. First, because we are more energetic than when getting old. Second, because we are a little bit idealistic, while everything tends to become relative after we have seen all kinds of behaviors in science. Last, because we are often single-minded at the beginning of our career; we do not have too much to read and we are not disturbed by administrative duties.

Of course, It is of great importance to have a clear and complete understanding of the papers that we cite. This is why young mathematicians play such an important role.