"Lead us not into temptation" implies a decision of the heart: "For where your treasure is, there will your heart be also.... No one can serve two masters." "If we live by the Spirit, let us also walk by the Spirit." In this assent to the Holy Spirit the Father gives us strength. "No testing has overtaken you that is not common to man. God is faithful, and he will not let you be tempted beyond your strength, but with the temptation will also provide the way of escape, so that you may be able to endure it."
Source: Catechism of the Catholic Church (Vatican.va)