The sin does not consist in the temptation itself, but in inviting it, or yielding to it Jesus himself was tempted "in all things as we are; yet without sin." Doubtless Satan, in the passage to which you refer, knew that Jesus had been fasting and so tried to tempt him to turn stones into bread. Again, believing that the desire for worldly power might influence him, he tried to tempt him by offering him the dominion of the whole earth, but again failed. It is not strictly correct to say that one cannot be tempted unless he has wrong desires. The tempter is always ready with his lures; but, if we rebuke our own desires and repel the temptation, asking divine strength to do this, the danger will pass. After conversion comes regeneration, and we are enabled to overcome sin. We may still be conscious of a struggle within, but we get strength to stand firm against it. The truly converted man is no longer the slave or bondman of sin, but is kept day by day from its power ever again having dominion over him.