Sin entered the world because of a disobedience committed by the first men, Adam and Eve. All the offspring of Adam and Eve had inherited sin in the flesh - not guilt, but a tendency or desire to do one's own will and not the will of God.
Temptation is incitement, the invitation to sin; it can come from our three spiritual enemies: the world, the devil and the flesh. "Each one is tempted by his own lusts, which attract and seduce him." It is necessary to clarify that it is not a sin to feel the temptation but only to consent it, that is, to accept it and voluntarily indulge in it.
"Each one is tested by being provoked and captivated by his own desire" (James 1:14).
The Bible explains the steps that lead to sin. James 1:15 says: "Desire, when it has become fruitful [or has conceived, gives birth to sin". In short, when we do not reject a bad desire, there comes a point where carrying it out is as inevitable as a pregnant woman giving birth. However, we are not slaves of bad desires; we can master them.
Jesus Christ said: "If that right eye of yours is making you stumble, pull it out and throw it from you" (Matthew 5:29). Obviously, Jesus did not speak in the literal sense. He wanted to say that, if we want to please God and obtain eternal life, we must control our bodies in order not to sin (Colossians 3: 5). That may mean firmly rejecting a temptation. A faithful servant of God asked in prayer: "Make my eyes go forward so they do not see what is useless".