"Coincidence is the simultaneous occurrence of causally unconnected events...If we visualize each causal chain progressing in time as a meridian on the globe, then we may represent simultaneous events by the parallel circles of latitude...Thus progressions of causal events proceed in one direction, while coincidences link these events from a completely different direction, in a completely different progression. One might say the "motives" of coincidence are of a different "character" or even from a different 'dimension' from causal events.
All the events in a man's life accordingly stand in two fundamentally different kinds of connection: firstly, in the objective, causal connection of the natural process; secondly, in a subjective connection which exists only in relation to the individual who experiences it, and which is thus as subjective as his own dreams, whose unfolding content is necessarily determined, but in the manner in which the scenes in a play are determined by the poet's plot. That both kinds of connection exist simultaneously, and the self-same event, although a link in two totally different chains, nevertheless falls into place in both, so that the fate of one individual invariably fits the fate of the other, and each is the hero of his own drama while simultaneously figuring in a drama foreign to him--this is something that surpasses our powers of comprehension, and can only be conceived as possible by virtue of the most wonderful pre-established harmony...It is a great dream dreamt by the single entity, the Will to Life: but in such a way that all his personae must participate in it. Thus, everything is interrelated and mutually attuned."
- Arthur Schopenhauer (1788 - 1860)