Al-Baqarah: 257
{Allah is the Guardian of those who believe}
Meaning: He intends for them to believe, so He treats them with gentleness until He brings them—by His grace and support—out of disbelief and into faith.
{And those who disbelieve}
Meaning: Those who are determined in their disbelief, their affair is the opposite of the former. Or, it means: Allah is the Guardian of the believers, bringing them out of religious doubts—should they encounter them—by guiding them and granting them success in resolving them, until they emerge from those doubts into the light of certainty.
{And those who disbelieve, their guardians are the devils, who bring them}
From the light of the clear proofs that appear to them, into the darkness of doubt and suspicion.