“mote” as in a speck of dust

“beam” as in a huge plank of wood

Basically don’t point out small faults of your neighbor while ignoring huge faults of your own.

It’s a metaphor. No one has a beam in their eye. But it’s a metaphor that drops suddenly in the second half, because you can literally imagine a mote in someone’s eye.

Its a bibpe verse against hypocrisy, essentially correct yourself before correcting others. Take the log put of your eye before you take it out of someone else's. The painting shows a guy talking with a log his face.

What the other person said but specifically take the tiny little thing out of your eye, before telling someone else to take the big huge thing out of their own.

Basically don't criticise unless you're perfect.