Dont worry, be happy, a quote from Epktetus, Epictetus, graffito on a Dublin wall, rainbow emerging from the mind

Epictetus (Greek: Ἐπίκτητος, Epíktētos; c. 50 – c. 135 AD) was a Greek Stoic philosopher. He was born into slavery at Hierapolis, Phrygia (present-day Pamukkale, in western Turkey) and lived in Rome until his banishment, when he went to Nicopolis in northwestern Greece for the rest of his life. His teachings were written down and published by his pupil Arrian in his Discourses and Enchiridion. Epictetus taught that philosophy is a way of life and not simply a theoretical discipline. To Epictetus, all external events are beyond our control; we should accept whatever happens calmly and dispassionately. However, individuals are responsible for their own actions, which they can examine and control through rigorous self-discipline.