There are several kinds of temptation. You can be tempted from without or from within.
Exterior temptation is pretty simple: it comes from outward suggestion. Somebody tries to get us to do something we shouldn’t.
Interior temptation, on the other hand, follows from inheriting a human nature wounded by the sin of our first parents. The wound makes us
tend towards evil without anybody else’s suggestion. We come into the world addicted to sin, and it doesn’t take much for us to get into trouble with those interior temptations.
It’s obvious that Jesus was tempted from without. Satan gave his best shot and failed. Was Jesus tempted from within? Since we believe Him to be totally perfect, he was free from Adam’s wound and so did not have those unreasonable motions that come from possessing a fallen human nature. We can safely conclude that Jesus was free from interior temptations.
Does temptation imply the capability of sinning? In *human *persons, yes. Adam and Eve suffered no interior temptations prior to the Fall. Their natures weren’t wounded yet. The temptations of Satan were external. After they fell, not only did they have to guard against exterior temptations, but to interior temptations as well.
Jesus is different. *Who *is He? He is the *divine *person of the Son who assumed a human nature. Someone could foolishly tempt God, and Deuteronomy 6:13 warns us not to do so. Yet God not only does not sin, but He can’t sin. To paraphrase Frank Sheed, nothing is impossible to God, and the possibility of God sinning is exactly that-- nothing-- which is impossible to God. When God makes human nature His own, this does not change.
However, don’t think that even though Jesus could not sin means that He had it easy when He was tempted. Because He is God the Son and possesses His human nature in all of its original integrity it wouldn’t mean that He suffered less than we do when we’re tempted. Far from it. It would mean that He felt the anguish
even more. Frank Sheed writes that Jesus called Peter “Satan” because in his suggestion, Peter was exposing Jesus to the kind of suffering in Gethsemane in which his sweat became like drops of blood.