I agree! Thus I present some of the condensed wit and wisdom of Seneca, every Saturday.
When you are about to rejoice most, you will have most to fear. When everything seems to you to be peaceful, the forces that will harm are not nonexistent, but inactive. Always believe that there will come some blow to strike you.
Moral Essays, Volume I, by Lucius Annaeus Seneca the Younger, translated by John W. Basore. Loeb Library.
Photo credit: Gunnar Bach Pedersen, courtesy Wikimedia Commons.