For happy clappy people who pretend that mindless positivism and ignoring negative FACTS can beat the blues, here's a dose of Seneca:
'It is better to conquer our grief than to deceive it.
For if it has withdrawn, being merely beguiled by pleasures and preoccupations,
it starts up again and from its very respite gains force to savage us.
But the grief that has been conquered by reason is calmed for ever.
Much better to look realistically at your rubbish and then be cheerful and carry on, than act as if its not there. Thanks to Maria Popova and Brain pickings: https://www.brainpickings.org/2017/05/02/seneca-consolation-to-helvia/