Anas b. Mālik Al-Anṣāri (raḍyAllāhu ‘anhu) the servant of the Messenger of Allah narrated:
Messenger of Allāh (ṣallallāhu ‘alayhi wa sallam) said,
“Verily, Allah is more delighted with the repentance of His slave than a person who lost his camel in a desert land and then finds it (unexpectedly).”
[Bukhārī and Muslim]
When God enables His slave to repent, He facilitates His happiness for him/her.
Whatever leads one to God’s happiness is from His Mercy.
God’s Mercy doesn’t lead to anything but Himself.
Therefore, the mercy of repentance leads to His Self.
This is why Shayṭān doesn’t want us to repent!