A rhythm of daily practice in meditation is more or less indispensable. Some mental image or theme or physical object must be taken and the mind focused upon it to the exclusion of all other irrelevant matters. As facility develops, the image must be a definitely elevating one, something to nourish spiritual aspiration and strengthen moral ideals. In the end, meditation must become the attempt to unite with the higher Self, of which only faint and intuitive glimpses are given at first (but later on they become strong and clear). The attempt to meditate usually takes up most of the allotted time. The achievement of meditation is itself brief and rare.
-- Notebooks Category 4: Elementary Meditation > Chapter 1: Preparatory > # 222