The existential attitude is one of involvement in contrast to a merely theoretical or detached attitude. “Existential” in this sense can be defined as participating in a situation, especially a cognitive situation, with the whole of one’s existence.
Paul Tillich, The Courage To Be (1952), pp. 123-124
Existentialism does not offer to the reader the consolations of an abstract evasion: existentialism proposes no evasion. On the contrary, its ethics is experienced in the truth of life, and it then appears as the only proposition of salvation which one can address to men.
This characteristic of Dasein’s being this “that it is” is veiled in its “whence” and “whither.”
Dasein is a being that does not simply occur among other beings. Rather it is ontically distinguished by the fact that in its being this being is concerned about its very being. Thus it is constitutive of the being of Dasein to have, in its very being, a relation of being to this being.Martin Heidegger
What I really need is to get clear about what I must do, not what I must know, except insofar as knowledge must precede every act. What matters is to find a purpose, to see what it really is that God wills that I shall do; the crucial thing is to find a truth which is truth for me, to find the idea for which I am willing to live and die.
The dilemma created by the existentialist “leap” is inescapable. Every attempted escape becomes an escape from existentialism itself. … It is one of the characteristics of existentialism that its adherents are continually on the verge of apostasy.
Knowledge of that which concerns us infinitely is possible only in an attitude of infinite concern.paul tillich
To assume that one’s existential task is completed when the individual is brought into right relation with society, that is, when the individual has been socialized, is to absolutize society and confuse society with God.merold westphal