Evil doesn't come from anywhere except within. Very basically, the three unwholesome roots or 'poisons' are ignorance, craving and aversion, and all misery is traced back to those three roots. The progenitor of craving and aversion is ignorance. As Buddhists we engage in practice to eradicate these three roots and how they manifest as discrete mental defilements.
With regards to pain - that depends upon what you mean. Depending upon what you mean - there are detailed explanations. But if you mean what I think you mean - difficult situations people find themselves, its the result (fruition) of one's kamma. Again, very basically, what you sow, so you shall reap. If you act with unwholesome intentions, so misery will follow. If you act with wholesome intentions, so happiness will follow. It is the Buddhist doctrine of causation.
There is no direct correlation between satan and any being in the Buddhist pantheon. A manifestation of 'evil' is a being of the deva realm known as Mara. But Mara is, like all beings, conditioned and does not live forever. Before the present being known as Mara, the jatakas (birth stories of the Buddha) suggest that the Buddha's personal attendant, Ananda, was the previous 'Mara'. Another thing to remember is that Mara is the one who endeavours to keep beings rolling around samsara - not necessarily trapped in hell realms. In one sutta, Mara, appearing in the retinue of the Brahma Baku, is portrayed as being the one who endeavours to keep Brahma deluded in believing he was the one who created the universe and the father of all beings.
But for many Buddhists, Mara is just an anthropomorphism of the five hindrances of sloth-torpor, restlessness-worry, sensual desire, doubt and ill-will, or mental defilements.
“No lists of things to be done. The day providential to itself. The hour. There is no later. This is later. All things of grace and beauty such that one holds them to one's heart have a common provenance in pain. Their birth in grief and ashes.”
- Cormac McCarthy, The Road
Learn this from the waters:
in mountain clefts and chasms,
loud gush the streamlets,
but great rivers flow silently.
- Sutta Nipata 3.725
(Buddhist aid in Myanmar) • •
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