To doubt things which are now believed without any further investigation whatsoever, that's the main point everywhere.
Whenever we change, a lot of things get too big or too small for us; useless in a word. Just as we outgrow a pair of trousers, we outgrow acquaintances, libraries, principles, etc., at times before they're worn out and at times---and this is the worst of all---before we have new ones.
Our life may be compared to a winter's day:
we are born between midnight and 1 A.M., it's 8 o'clock before
day dawns, it gets dark again before 4 in the afternoon, and around
midnight we die.
These are examples of aphorisms that were written by Lichtenberg in the 1700's. Although he died in 1799, his words have a modernity that can't be denied. His Waste Books, a series of journals, are finally translated and published.