Most Important Set of Books?

There two books I constantly consult thought the year.

1. Incerto by Nassim Taleb

2. Pocket Oracle by Baltasar Gracion

1) Is very popular (though not throughly read)

2) Is not known much. But I would say its the most important book todo with "association with humans"

My view of the world changed completely by reading these books.

But I came across them completely by mistake.

Maybe other people have books they feel the same about?

Please share some titles.