From the epic Paradise Lost, what is Satan's main motive for tempting Adam and Eve to sin?

In the first part of Paradise Lost,
Satan finds himself in hell after the failure of his rebellion against God.  Miserable
that he has lost paradise, Satan is nevertheless unrepentant and prideful.  He utters
the often quoted lines:

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Better to reign in Hell than serve in
Heaven.

He tells Beelzebub
his plan to regain the grounds he has lost.  They conspire to "wage by force or guile
eternal war" against their "grand Foe."  To do so, they spot the "dreary plain" earth,
and plan to go there to renew their forces and to thwart God's mission to bring forth
good.

"Our
labor must be to pervert that end,

And out of good still to
find means of means of
evil"

The temptation of Adam
and Eve is the result of this plan to create evil and to attempt to sabotage God's
design.