Despite the fact that the simile being used is to describe how one should guard one’s mind full of love (or so says the Venerable Thanissaro Bhikkhu), the semantic drift of one imagining oneself as a mother to all beings is still quite useful. Of all the suttas in the Canon I have to admit that the Karaniya Metta Sutta is one of my favorites.
Cattāri Brahmavihārā 
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