"Autopsicographia" by Fernando Pessoa
The following is one of many interpretations:
"The poet fancying each belief"
The poet fancying each belief
So wholly through and through
Ends by imagining the grief
He really feels is true.
And those who read what he has spelt
In the read grief feel good--
Not in the two griefs he has felt,
But one they never could.
Thus to beguile and entertain
The reason, does he start,
Upon its rails, the clockwork train
That's also called the heart.
Interpretation by Roy Campbell