Verba volant, scripta manent

Verba volant, scripta manent is a Latin proverb, which translates as "(spoken) words fly away, written ones remain". Other versions include verba volant, (sed) littera scripta manet, "(spoken) words fly away, but the written letter remains".

Origin and meaning
The authorship of this proverb is, as with many others, unknown, but it was well-known by the seventeenth century, when it was used in Francis Turretin's "De Libro Vitae".

The general meaning is that spoken words are ephemeral, and easily forgotten or disputed, but writing can be relied on to prove what was said or agreed to. Applied in a legal context, it means that if people wish to establish a formal agreement, it is best to put it in writing, in order to avoid the disputes that may arise from an oral agreement.