Religion comes strongly to mind when reading this, even though it isn't implicitly mentioned :P

"Just because something feels good, or feels true, doesn’t make it true."

Perhaps worth noting is that the exact opposite can be said:

Just because something feels bad, or feels untrue, doesn’t make it untrue.

And...

Just because something feels good, or feels true, doesn’t make it true - or untrue.

How something feels has little (or most likely nothing) to do with whether or not it is true. Our feelings are valid and important, but we mustn't read more into them than appropriate.