I use Plantinga's definition of libertarian freewill: Scenario: A true believer is tempted to sin. Now here is the Logical Construct based upon the scenario and definition above: (A) If it was within a believers power to choose to resist a temptation to sin, and it was within the believers power to choose sin, then a believer has libertarinan freewill. 1) It was within the believer's power to resist a temptation (1 Cor. 10:13). 2) It was within the believer's power to sin (Mk 14:38). (B1) Therefore, it was within the believers power to resist temptation and it was within the believer's power to sin. (B2) Therefore, the believer had libertarian freewill. 1 Corinthians 10:13 NIV: No temptation has seized you except what is common to man. And God is faithful; he will not let you be tempted beyond what you can bear. But when you are tempted, he will also provide a way out so that you can stand up under it Mark 14:38 NIV Watch and pray so that you will not fall into temptation. The spirit is willing, but the body is weak."