Does the Bible provide any passages that might help in understanding how Satan became sinful?

Does the Bible provide any passages that might help in understanding how Satan became sinful? | ChristianityStackExchange

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“How you are fallen from heaven,

O Day Star, son of Dawn!

How you are cut down to the ground,

you who laid the nations low!

13 You said in your heart,

‘I will ascend to heaven;

above the stars of God

I will set my throne on high;

I will sit on the mount of assembly

in the far north;

14 I will ascend above the heights of the clouds,

I will make myself like the Most High.’

15 But you are brought down to Sheol,

to the depths of the Pit.

16 Those who see you will stare at you,

and ponder over you:

‘Is this the man who made the earth tremble,

who shook kingdoms,

17 who made the world like a desert

and overthrew its cities,

who did not let his prisoners go home?’

18 All the kings of the nations lie in glory,

each in his own tomb;

19 but you are cast out, away from your sepulchre,

like a loathed untimely birth,

clothed with the slain, those pierced by the sword,

who go down to the stones of the Pit,

like a dead body trodden under foot.

20 You will not be joined with them in burial,

because you have destroyed your land,

you have slain your people.” [Is 14]

Deduced two days ago … Thanks be to God through his angel (+ St. Thomas Aquinas?) … simple and elegant.