Virtue is presupposed in friendship.
Body', '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.
In other countries, success has been achieved with embryo transfer in a different rhino species, thus that as a technique can be presupposed to be the most promising, However, consultations are ongoing amongst different reproductive technique experts on the way forward.
The soul is presupposed as a ready-made agent, which displays such features as its acts and utterances, from which we can learn what it is, what sort of faculties and powers it possesses -- all without being aware that the act and utterance of what the soul is really invests it with that character in our conception and makes it reach a higher stage of being than it explicitly had before.
Reaching and understanding is the process of bringing about an agreement on the presupposed basis of validity claims that are mutually recognized.
Even originally well-defined pencils of cathode rays from the Sun cannot reach the Earth. For Birkeland's theories to be correct, the existance of such cathode rays is clearly presupposed to be necessary. . . and this assumption is untenable.