There are two ways to interpret the question, what does he know about us humans, what does he know about each saint individually?

Tune in to hear more!

Resources:

Answers in Genesis, Who is Satan?

Martyn Lloyd-Jones preached about Good Angels here.

LLoyd-Jones' companion sermon about the unholy angels is lost but the transcript is here: fallen-angels-sermon-transcription-lloyd-jones

Grace to You: Can satan hear our thoughts?

The End Time: Angels part 1

Podcast Haunted Cosmos (if you're into the weird and strange)

Questions about Angels & Demons (All)

Music attribution

Track New York

Music by https://www.fiftysounds.com

Track London

Music by https://www.fiftysounds.com