Full Idea
For Leibniz, it is by virtue of possessing memory and self-consciousness that human minds are moral beings, capable of reward and punishment.
Gist of Idea
Humans are moral, and capable of reward and punishment, because of memory and self-consciousness
Source
report of Gottfried Leibniz (works [1690]) by Nicholas Jolley - Leibniz Ch.4
Book Reference
Jolley,Nicholas: 'Leibniz' [Routledge 2005], p.98
A Reaction
I like this because it makes no mention of free will (though Leibniz struggled to defend free will). I would add meta-thought (the ability to ponder and evaluate our own thinking), which makes a change of mind possible.