Is Mara a real being or something internal, produced by our own minds?
Two snippets from suttas refering to Mara as an entity/position:
MN 115:

&quot;But, venerable sir, in what way can a bhikkhu be called skilled in what is possible and what is impossible?&quot;
&quot;Here, Ananda, a bhikkhu undersands [...]: &quot;It is possible that a man might occupy the position of Māra [...]&quot;

MN 50:

The venerable Maha Moggallana saw him [Māra] standing there and said: &quot;I see you there too, Evil One. Do not think 'He does not see me.' You are standing against the door bar, Evil One.
&quot;It happened once, Evil One, that I was a Māra named Dusi [...]

A sutta where a disciple directly asks what is Māra (SN 23.1):

&quot;Venerable sir, it is said, 'Māra, Māra.' In what way, venerable sir, might Māra be?&quot;
&quot;When there is form, Radha, there might be Māra, or the killer, or the one who is killed.&quot;

The above are from Nanamoli/Bodhi translations. Bhikkhu Bodhi also writes in a note of the Majjhima Nikaya:

The name means &quot;the Corrupter&quot; or &quot;the Corrupted One&quot;. In the Buddhist conception of the universe, the position of Mara, like that of Maha Brahma, is a fixed one that is assumed by different individuals in accordance with their kamma.