The Overcomers
Therefore, brethren, having boldness to enter the Holiest by the blood of Jesus, by a new and living way which He consecrated for us, through the veil, that is, His flesh.
- Hebrews 10:19-2
How do we overcome the devil? In the book of Revelation we are introduced to a group of believers who are able to do that: "And they overcame him by the blood of the Lamb and by the word of their testimony, and they did not love their lives to the death" (Revelation 12:11)
They overcame him by the blood of the Lamb. The next time the devil tempts you to think that you are not worthy to approach God, here is what I advise: Agree. Say, "You are right. I am not worthy to approach God. I never was worthy to approach God. I never will be worthy to approach God. My access to God's presence is not based on my worthiness, it is based on what Christ did for me on the cross."
Sometimes we get into the mentality as Christians that if we are doing well spiritually, then we can approach God in prayer. If we get up in the morning, read four chapters from the Bible, give thanks for our meals, and share our faith with someone, then we think we can approach God. But if the next day we sleep in and don't read the Bible, if we forgot to say grace over our meals and didn't share our faith, then we think we are not worthy to approach Him.
While doing those things is important, the point I am making is this: Your access to God is there unconditionally. If you have done well, then great. Approach God. But if you have sinned, then approach God and say, "Lord, I have sinned. This is why I need the blood of the Lamb."
The devil always will try to keep you away from the Cross. But the Holy Spirit always will bring you to it.