But he said to me, "My grace is sufficient for you, for my power is made perfect in weakness." Therefore I will boast all the more gladly about my weaknesses, so that Christ's power may rest on me.
We are not sustained by the power of mere men or a mere organization, but we are kept by the power of God through His only begotten Son, the Lord Jesus Christ. Like apostle Paul, we will gladly boast about our weaknesses. What are these weaknesses? The sufferings we go through just to overcome the sinful nature of the Devil in us. We will suffer much to overcome and put to death all its misdeeds in us. We will suffer much to resist sin even to point of death to all its misdeeds in us. "God's grace is sufficient for you" here does not mean that you live a life obeying the sinful nature of the Devil in you and still God gives you grace. It means that you suffer so much in your body just to put to death the misdeeds of the sinful nature of the Devil in you, and yet God's grace through Christ's power carries you though triumphantly till the end.
Apostle Paul, had the 'messenger of satan' sitting in his body to hinder him from doing God's work but God carries him through victoriously. The Devil was trying to prove to Paul that on this earth, he is still the 'prince of the air' but Paul through the power of Christ showed that he only belonged to the Prince of Peace, the Lord Jesus Christ. He went ahead and planted churches for God's glory with Christ's power. He went ahead and wrote under the anointing of God's Spirit, the fourteen books of the New Testament. He went ahead and showed forth the power of God through the calling and apostleship he was given by Christ Himself. He showed how he did his ministry with the testimony that Christ's power rested on him fully and that he did not do the ministry by his own strength or strength of an organization. He didn't mind the 'attack' on his body by the Devil. He trusted in the power of God through Christ. God's power through Christ is made perfect in the weaknesses in our body. We need the power of Christ to fill us to do Christ's work on earth. If we don't have that, we cannot do anything for Christ and our God. Apostle Paul victoriously testified to this till the end.
2 Corinthians 12:7-9
To keep me from becoming conceited because of these surpassingly great revelations, there was given me a thorn in my flesh, a messenger of Satan, to torment me. Three times I pleaded with the Lord to take it away from me. But he said to me, "My grace is sufficient for you, for my power is made perfect in weakness." Therefore I will boast all the more gladly about my weaknesses, so that Christ's power may rest on me.