In our ordinary mind we perceive the stream of thoughts as continuous, but in reality this is not the case. You will discover for yourself that there is a gap between each thought. When the past thought is past, and the future thought has not yet arisen, you will find a gap in which the nature of the mind is revealed: so the work of meditation is to slow down, to make that gap become more and more apparent.

Sogyal Rinpoche,  Glimpse after Glimpse