A search for justification and the impossibility of justification are recurrent motifs in the philosophy of Sartre. His philosophy is one of the incarnations of problematism and of the ambiguity of contemporary thought (for Man does seem, to the contemporary mind, to be ambiguous).
contemporaryquotes
The patient cannot remember the whole of what is repressed in him, and what he cannot remember may be precisely the essential part of it. He is obliged to repeat the repressed material as a contemporary experience instead of remembering it as something in the past.
contemporary / past / patient / remember / repressed
I wish to understand [Plato], but to treat him with as little reverence as if he were a contemporary English or American advocate of totalitarianism.