Richard Foster has written this gem of a book about the classical disciplines of the spiritual life: Celebration of Discipline. I've pulled out some good quotes and summarized a few of the ideas, but they are not particularly coherent.
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Slow down and stop hurrying; busy-ness promotes superficiality.
The world needs deep people.
This is not about emptying your mind, but filling it with truth. Eventually, the inward reality will become evident in our outward word and deep. We need to be constantly reminded that the physical, causal approach our society takes is NOT all there is; the spiritual realm is equally real and important. Meditation reminds us of this.
Being in God's presence is what changes us.
It is best to have a specific time and place for meditation. Close your eyes, meditate on an object, a picture. Use your imagination! Pay attention to your dreams. Release your concerns and fears to God and get some of His perspective. Meditate on scripture or an unfolding scene in your imagination. Meditate on the events of your day.