Most of your thoughts are not your own but derivations from the cultural moment you inhabit, and that of course includes this thought. It's not merely that, it's more as if each thought or element of reflective experience comes with a signature, with a more or less hidden label certifying its origin, its lineage and date, its appellation d'origine contrôlée. If you aren't aware of it it means that it is likely to be recent and more or less concocted. It is truly your own only if it reaches across time and gives you the sudden intuition of timelessness which is no more than the medium in which the self has its being; and time is only the ground-up powder of diverse timeless moments. The apparent flow of time belongs only to the profusion of succeeding objectivities - there is no retention and protention on the subjective side only a shimmering of multiple moments known immediately and without separation. This is the intensive manifold whose logic is incompatible with that of the extensive manifolds of perceptual reality.