Being and time determine each other reciprocally, but in such a manner that neither can the former - Being - be addressed as something temporal nor can the latter - time - be addressed as a being.
Martin HeideggerBeing-alone is a deficient mode of being-with; its possibility is a proof for the latter.
Martin HeideggerThe small are always dependent on the great; they are "small" precisely because they think they are independent. The great thinker is one who can hear what is greatest in the work of other "greats" and who can transform it in an original manner.
Martin HeideggerBody', 'soul', and 'spirit' may designate phenomenal domains which can be detached as themes for definite investigations; within certain limits their ontological indefiniteness may not be important. When, however, we come to the question of man's Being, this is not something we can simply compute by adding together those kinds of Being which body, soul, and spirit respectively possess--kinds of being whose nature has not as yet been determined. And even if we should attempt such an ontological procedure, some idea of the Being of the whole must be presupposed.
Martin Heidegger