The sonnet is a cascade of paradoxes: «Love is a fire that burns unseen; a wound that hurts and is not felt; a contentment discontented; a pain that rages without hurting.» Camões defines love only by contradictions, and each line is an impossibility that is nonetheless true.
To love no more than to wish well; to walk alone among people; to be held prisoner by one's own will; to keep faith with the one who kills us. And at the end, the question that crowns it: how can this Love, so contrary to itself, bring accord to human hearts? It is among the most famous sonnets in the Portuguese language.
The verse is kept in Portuguese. Translating it in passing would replace the work with a paraphrase of it.