Here are the pali textual references that are maybe the basis for the things you've heard. Although the expression of realizing one's enlightened nature is rather unusual for Theravada and is closer to Mahayana.
AN 1.49-52
"Luminous, monks, is the mind. And it is defiled by incoming defilements."
"Luminous, monks, is the mind. And it is freed from incoming defilements."
"Luminous, monks, is the mind. And it is defiled by incoming defilements. The uninstructed run-of-the-mill person doesn't discern that as it actually is present, which is why I tell you that — for the uninstructed run-of-the-mill person — there is no development of the mind."
"Luminous, monks, is the mind. And it is freed from incoming defilements. The well-instructed disciple of the noble ones discerns that as it actually is present, which is why I tell you that — for the well-instructed disciple of the noble ones — there is development of the mind."
SN 15.11
At Savatthi. There the Blessed One said: "From an inconstruable beginning comes transmigration. A beginning point is not evident, though beings hindered by ignorance and fettered by craving are transmigrating & wandering on. When you see someone who has fallen on hard times, overwhelmed with hard times, you should conclude: 'We, too, have experienced just this sort of thing in the course of that long, long time.'
"Why is that? From an inconstruable beginning comes transmigration. A beginning point is not evident, though beings hindered by ignorance and fettered by craving are transmigrating & wandering on. Long have you thus experienced stress, experienced pain, experienced loss, swelling the cemeteries — enough to become disenchanted with all fabricated things, enough to become dispassionate, enough to be released."
Dhp 170
One who looks upon the world as a bubble and a mirage, him the King of Death sees not
Sn22.95
Form is like a glob of foam;
feeling, a bubble;
perception, a mirage;
fabrications, a banana tree;
consciousness, a magic trick —
this has been taught
by the Kinsman of the Sun.
However you observe them,
appropriately examine them,
they're empty, void
to whoever sees them
appropriately.
Beginning with the body
as taught by the One
with profound discernment:
when abandoned by three things
— life, warmth, & consciousness —
form is rejected, cast aside.
When bereft of these
it lies thrown away,
senseless,
a meal for others.
That's the way it goes:
it's a magic trick,
an idiot's babbling.
It's said to be
a murderer.[1]
No substance here
is found.
Thus a monk, persistence aroused,
should view the aggregates
by day & by night,
mindful,
alert;
should discard all fetters;
should make himself
his own refuge;
should live as if
his head were on fire —
in hopes of the state
with no falling away.
As to reconciliation, this should help;
Sn12.61
"Monks, an uninstructed run-of-the-mill person might grow disenchanted with this body composed of the four great elements, might grow dispassionate toward it, might gain release from it. Why is that? Because the growth & decline, the taking up & putting down of this body composed of the four great elements are apparent. Thus the uninstructed run-of-the-mill person might grow disenchanted, might grow dispassionate, might gain release there.
"But as for what's called 'mind,' 'intellect,' or 'consciousness,' the uninstructed run-of-the-mill person is unable to grow disenchanted with it, unable to grow dispassionate toward it, unable to gain release from it. Why is that? For a long time this has been relished, appropriated, and grasped by the uninstructed run-of-the-mill person as, 'This is me, this is my self, this is what I am.' Thus the uninstructed run-of-the-mill person is unable to grow disenchanted with it, unable to grow dispassionate toward it, unable to gain release from it.
"It would be better for the uninstructed run-of-the-mill person to hold to the body composed of the four great elements, rather than the mind, as the self. Why is that? Because this body composed of the four great elements is seen standing for a year, two years, three, four, five, ten, twenty, thirty, forty, fifty, a hundred years or more. But what's called 'mind,' 'intellect,' or 'consciousness' by day and by night arises as one thing and ceases as another. Just as a monkey, swinging through a forest wilderness, grabs a branch. Letting go of it, it grabs another branch. Letting go of that, it grabs another one. Letting go of that, it grabs another one. In the same way, what's called 'mind,' 'intellect,' or 'consciousness' by day and by night arises as one thing and ceases as another.
"The instructed disciple of the noble ones, [however,] attends carefully & appropriately right there at the dependent co-arising:
"'When this is, that is.
"'From the arising of this comes the arising of that.
"'When this isn't, that isn't.
"'From the cessation of this comes the cessation of that.
"'In other words:
"'From ignorance as a requisite condition come fabrications.
"'From fabrications as a requisite condition comes consciousness...