The question of presence is one that affects all the other attributes of the relationship of love, as it forces us to examine them in relation to time, that is diachronically. The fluctuation of needs and desires, the loss and gain of property, even the maintenance of what one is, what one has, and what one thinks one will become—all these depend, to a certain degree, on presence. Considerations of presence are as much concerned with the present as they are with the future. As Socrates says: '…it is the preservation of what he now has in time, so that he will have it then.' One always yearns for that which is not present. Presence is to be differentiated from property, in that it does not express a relationship of having but of being-in-the-present, not of possession, but of immediacy, not of ownership, but of persistence.