Instrumental or, as I have been calling it, "proleptic' time, is one way of organizing time's interval. We expect the future to be different from the present that appears before us now, and we regard the present as an obstacle to the realization of that second, future moment. The temporal organization of habit, as described by Bergson on the other hand, is based on a certain symmetry between the tenses. For this reason, the comparison between them can be instructive.