Judas & Peter (Eternal Security or Once Saved, Always Saved)

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].