Recently a monk shared this with me. His is a markedly apophatic approach to spirituality, so this may not speak to everyone. But for the monk and I suppose anyone else who shares his approach to prayer, this little mnemonic is a tool to assist in remembering the contours of deep contemplation.
It involves remembering the “ENDS” of prayer, in this way:
Of course, entering into the emptiness, nothingness, darkness and silence of contemplation is not to suggest that all we are going to find there is a void. Rather, we are approaching the frontier of Mystery (with a capital “M”). We seek the One who is hidden in the darkness, whose voice rings out in the silence, whose presence becomes known in the emptiness and the nothingness. Or, perhaps a better way to see this, we dispose ourselves to be found by the One who seeks us.