“Life being what it is, one dreams of revenge — and has to content oneself with dreaming.”

Source: The Stars My Destination (1956), Chapter 12 (p. 194).

Source: The Dream of a Ridiculous Man (1877), V
Context: A dream! What is a dream? And is not our life a dream? I will say more. Suppose that this paradise will never come to pass (that I understand), yet I shall go on preaching it. And yet how simple it is: in one day, in one hour everything could be arranged at once! The chief thing is to love others like yourself, that's the chief thing, and that's everything; nothing else is wanted — you will find out at once how to arrange it all. And yet it's an old truth which has been told and retold a billion times — but it has not formed part of our lives! The consciousness of life is higher than life, the knowledge of the laws of happiness is higher than happiness — that is what one must contend against. And I shall. If only everyone wants it, it can be arranged at once.

¿Qué es la vida? Un frenesí.
¿Qué es la vida? Una ilusión,
una sombra, una ficción,
y el mayor bien es pequeño;
que toda la vida es sueño,
y los sueños, sueños son.
Variant:
What is this life? A frenzy, an illusion,
A shadow, a delirium, a fiction.
The greatest good's but little, and this life
Is but a dream, and dreams are only dreams.
(trans. Roy Campbell)
Segismundo, Act II, l. 1195.
La vida es sueño (Life is a Dream)

1910s
Source: Quoting Plato, as translated by Abraham Arden Brill, "The Interpretation of Dreams" https://en.wikisource.org/wiki/Page:Freud_-_The_interpretation_of_dreams.djvu/511 (1913 edition), p.493

The Tragic Sense of Life (1913), X : Religion, the Mythology of the Beyond and the Apocatastasis

Source: Everything Is Illuminated