296. Say one dwells contemplating the body – ardent, clearly conscious and mindful – having put aside the attraction and repulsion of the world. As he does this, either some bodily feeling arises, bodily discomfort arises, or drowsiness scatters his thoughts to external things. Then his attention should be directed to some pleasurable object or thought. Having done that, delight springs up in him; being delighted, happiness arises, and the mind that is happy is concentrated. Then he thinks: “The aim on which I set my mind is now attained. Come, let me withdraw my mind from that pleasant thought.” So, he withdraws his mind from that, and neither starts nor carries on thought processes.
Samyutta Nikaya V.155
Cattāri Brahmavihārā 
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