Better be wise by the misfortunes of others than by your own.
"Be Prepared." "Be prepared for what?" "Why, for any old thing."
History repeats itself. So you might wanna pay attention.
It is a good thing to learn caution from the misfortunes of others.
History counsels caution.
To be prepared against surprise is to be trained. To be prepared for surprise is to be educated.
If you know from history the danger, then part of the danger is over because it may not take you by surprise as it did your ancestors.
It is better to be frightened now than killed hereafter
There are no guarantees, but being ready sure beats being taken by surprise
The ancients called happy those who learned caution from the danger of others
Frederick II Hohenstaufen
The bird alighteth not on the spread net when it beholds another bird in the snare. Take warning by the misfortunes of others, that others may not take example from you.