tabula rasa (philosophy) blank slate (used by philosophical empiricists to describe the state of the human mind at birth before having any sense experiences).
Ex nihilo nihil fit. (philosophy) Nothing is made from nothing. (used to describe a materialistic Greek cosmology which stands opposed to the Judeo-Christian cosmology expressed in the phrase creatio ex nihilo: creation from nothing)
in vino veritas There is truth in wine. (used to show that people who have consumed too much alcohol will reveal things that they wouldn’t reveal otherwise)