Romans 3:23 For all have sinned, and come short of the glory of God.
Thus, because of our fallen nature, and all the latent tendencies it comes with, persons naturally follow the lead of carnal cravings and desires, unless they are constrained by the presence and power of God continually. In other words, if God were to destroy devils in the morning, and if God were to put them permanently out of commission, or consign them to never-land, phantom temptations would continue to exist, and would continue to morph into evil words and deeds, just the same as if the devil was alive and well.
This means that the problem with temptation is not so much external as it is internal as the first passage makes plain. Jesus pointed poignantly to this issue of the human experience, as the cause of the sinful action in most instances, and then He further makes mention of the fact that persons often sin in their minds, without any follow-up overt actions.
This fact above all else should cause each one of us to engage in deep and thorough soul-searching, to determine and know whether the temptations we are afflicted with are being engineered externally, or if perchance, they are being churned out in our own private factory.
James 1:14 But every man is tempted, when he is drawn away of his own lust, and enticed. 15 Then when lust hath conceived, it brings forth sin: and sin, when it is finished, brings forth death.
May The Lord add His blessing to the study of His word. God bless!