The Satan justified his decision to entice Adam and Eve to eat from the tree of knowledge, to "excite their minds to know more" and to "reject /envious commands, curated with design".
As well as by considering it "suspicious" and "reasonless"
It is so because he wonders, whether the God has deprived the humans of knowledge due to envy. He thinks that God does not want Adam and Eve to eat from the Tree of Knowledge because doing so would make them equal to gods.
Satan does not think that obtaining knowledge can be a sin and finds it unfair that God has chosen to keep Adam and Eve ignorant to secure their piety and faithfulness.
To learn more about "Tree of Knowledge" here
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