Two short quotations from Alfréd Rényi, which together give a rather charming picture of the mathematical lifestyle.
If I feel unhappy, I do mathematics to become happy. If I am happy, I do mathematics to keep happy.
Quoted in P Turán, “The Work of Alfréd Rényi”, Matematikai Lapok 21 (1970) 199-210.
A mathematician is a machine for turning coffee into theorems.
(Widely attributed to Paul Erdős, but apparently due to Rényi.)
It’s Monday morning and I feel gloomy. Pass the coffee, please.