una hirundo non facit ver

one swallow does not make summer

Notes

A single example of something positive does not necessarily mean that all subsequent similar instances will have the same outcome.

Words

facis – a bundle, packet
facies – appearance, aspect, condition, countenance, face, look, visage
facina – action, bad deed, crime, deed, villainy
facile – easily, readily, without difficulty
non – not
facio – be of service, help, suffer, suit, to experience, to give permission, to sacrifice