[Meditation] is a duty wherein the very heart and life-blood of piety lies. Meditation may be thus described: it is a holy exercise of the mind; whereby we bring the truths of God to remembrance, and do seriously ponder upon them and apply them to ourselves. In meditation there are two things:

  1. A Christian’s retiring of himself, a locking himself up from the world. Meditation is a work which cannot be done in a crowd.
  2. It is a serious thinking upon God. It is not a few transient thoughts that are quickly gone—but a fixing and staying of the mind upon heavenly objects: this cannot be done without exciting all the powers of our souls, and offering violence to ourselves.

—Thomas Watson
The Christian Soldier, or Heaven Taken by Storm (Robert Moore, 1816).