But, it is also necessary to set apart particular seasons of retirement for fixed and holy meditation. This position is warranted by Scripture. Holy men of old embraced the most favorable opportunities for this devout exercise. Isaac went out into the field to meditate in the stillness and solemnity of the evening. David sometimes chose the calmness of the morning. At other times, he fixed his thoughts in holy meditation, during the wakeful hours of the night. "I remember thee _upon my bed_, and meditate on thee in the night-watches." "Mine eyes prevent the _night-watches_, that I might meditate in thy word." But, lest the adversary should get the advantage of you, fix upon _regular seasons_ for this sacred employment. Select some subject, and think upon it deeply, systematically, practically, and devoutly. System is a great assistance in everything. We can never obtain clear views of any complex object, without separately viewing the various parts of which it is composed. We cannot see the beautiful mechanism of a watch, nor understand the principles which keep it in motion, without taking it in pieces, and viewing the parts separately. So, in contemplating any great truth, which contains many different propositions; if we look at them all at once, our ideas will be confused and imperfect; but if we separate them, and examine one at a time, our views will be clear and distinct. Our meditation must be _practical_, because every divine truth is calculated to make an impression upon the heart; and if it fails of doing this, our labor is lost. Make, then, a direct personal application of the truth, on which your thoughts are fixed. But, our meditations must also be _devotions_. They must all be mixed with prayer. As an example of what I mean, examine the 119th Psalm. There the Psalmist, in the midst of his meditations, was continually lifting up his soul in prayer. His devout aspirations are breathed forth continually. Your success in this exercise, and the profit you derive from it, will very much depend on the manner you observe this direction.