Perseverance of the Saints

Regarding the concept of "eternal security" and the parable of "The Sower" could the examples of Peter's faithfulness and Judas' failure show that Peter was really saved and Judas was not? [Matthew 13:18-23, Luke 8:1-15, 1 Timothy 4:1-5, 2 Timothy 4:10-11, 1 John 5:13, John 15:6, Matthew 7:21-23, Jude 1:24-25, 1 Peter 5:1].

If a 5-point Calvinist can't know if he is saved, isn't that directly contradicting scripture about assurance of salvation? [1 Corinthians 3:17, 1 Corinthians 10:12].

Could you talk a little bit about "Once Saved, Always Saved?" [1 John 5:11-12, John 15:6, Revelation 3:16].

Caller disagrees with Steve about free will positing that God and man cannot both have free will. [1 Peter 1:5, Romans 8:16-19, Matthew 10:33, Ephesians 2:8, 1 Peter 2:17, 1 Timothy 4:1, 2 Peter 2:22, Galatians 5:22-23, Luke 8:13].

What are your thoughts on the Calvinist view of "once saved, always saved" and "election" (we don't choose God, He chooses us)? [Romans 11:22, John 15:6-7].