We may acquire the resolution to be happy by resting on a bed of roses.
If that fails us, we should try a bed of nettles.

If I have faltered more or less
In my great task of happiness;
If I have moved among my race
And shown no glorious morning face;
If beams from happy human eyes
Have moved me not; if morning skies,
Books, and my food, and summer rain
Knocked on my sullen heart in vain:—
Lord, thy most pointed pleasure take
And stab my spirit broad awake;
Or, Lord, if too obdurate I,
Choose thou, before that spirit die,
A piercing pain, a killing sin,
And to my dead heart run them in!

Robert Louis Stevenson.