Do we in our time have an answer to the question of what we really mean by the word ‘being’? Not at all. So it is fitting that we should raise anew the question of the meaning of Being. But are we nowadays even perplexed at our inability to understand the expression ‘Being’? Not at all. So first of all we must reawaken an understanding for the meaning of this question. Our aim in the following treatise is to work out the question of the meaning of Being and to do so concretely. Our provisional aim is the Interpretation of time as the possible horizon for any understanding whatsoever of Being.
from Martin Heidegger “Being and Time” (Translated by John Macquarrie & Edward Robinson)