This bright green postcard has the latin phrase "Nihil agere delectat", and the English translation underneath which reads "It is pleasant to do nothing". It is a quote by the Roman lawyer Cicero.
The meaning is pretty obvious, it is nice to sit back and just daydream or gaze out the window on occasion. Obviously you can't do that all the time otherwise you'll never get anything done.
Finer details; - Measures 14.9 cm x 10.6 cm (fairly standard postcard size) - Lovely thick card. - Glossy finish. - Blank at the back with one line of text at the bottom left showing my URL so you remember where you bought it from!