In Christianity and Thelema, which we should recall are respective heresies of an older tradition, there is an idea that is central, and which is generally ignored by alleged adherents. This is the idea of surrender, and of diminishment and indeed destruction of self to serve the Great Work.
I think if Jesus' lesson was that we can be more than we let ourselves be, it would not be much different than the US Army's "Be All You Can Be". Yet I think their encouragements would have very different aims. So maybe their messages are also not very alike.
Jesus was mainly concerned that the spirit of the Law had been lost, because worship of the Laws had replaced concern for the Will of God, particularly as that might work through any human being. As for forgiveness, that was offered simply enough, but not without qualification. For example, a person, whose behavior clearly demonstrated he had not been salvaged, even after he affirmed faith by the magic words, was not saved. Nevertheless, no human was to judge this shortcoming in any cosmic respect in another, since who can know the ultimate plan, which may incorporate evil people and their ways (as Gandalf pointed out as well).
As for Thelemites, they are caught between the occult rock, upon which Thelema is built and which they generally do not understand, and the soft place of their cultural sensibilities, towards which they will escape and from which they will interpret Thelema, to conform it to their respective, respectable, zones of comfort. A pointless exercise. If there is an Aeonic change coming, it will be unbelievably destructive, not comforting or sustaining.
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Aleister Crowley - Letters Between Aleister Crowley And Frieda Harris
Wim Van Den Dungen - Enoch And The Day Of The End