Primo Levi said this quote

Sooner or later in life everyone discovers that perfect happiness is unrealizable, but there are few who stop to consider the antithesis; that perfect unhappiness is equally unattainable.

~ Primo Levi

He was a physicist, more precisely an astrophysicist, diligent and eager but without illusions: the Truth lay beyond, inaccessible to our telescopes, accessible to the initiates. This was a long road which he was traveling with effort, wonderment, and profound joy. Physics was prose: elegant gymnastics for the mind, mirror of Creation, the key to man's dominion over the planet; but what is the stature of Creation, of man and the planet? His road was long and he had barely started up it, but I was his disciple: did I want to follow him?

~ Primo Levi

This is the most immediate fruit of exile, of uprooting: the prevalence of the unreal over the real. Everyone dreamed past and future dreams, of slavery and redemption, of improbable paradises, of equally mythical and improbable enemies; cosmic enemies, perverse and subtle, who pervade everything like the air.

~ Primo Levi

...In our days many men have lived in this cruel manner, crushed against the bottom, but each for a relatively short period; so that we can perhaps ask ourselves if it is necessary or good to retain any memory of this exceptional human state. To this question we feel that we have to reply in the affirmative. We are in fact convinced that no human experience is without meaning or unworthy of analysis, and that fundamental values, even if they are not positive, can be deduced from this particular world which we are describing…

~ Primo Levi