This attitude was called hesychia, ‘tranquillity’ or ‘interior silence.’ Since words, ideas and images can only tie us down in the mundane world… the mind must be deliberately stilled by the techniques of concentration, so that it could cultivate a waiting silence.
Armstrong defines hesychia as the Greek contemplative practice of deliberately stilling the mind beyond images and concepts in order to apprehend a transcendent Reality, situating it within the apophatic tradition.
, A History of God, 1993thesis