The necessity of both the believer's Perseverance, and of God's Preservation
(You will find it helpful to LISTEN to the Audio, as you READ the text below.)
Part 1. The NECESSITY of the believer's perseverance.
"All men will hate you because of Me, but he who endures to the end will be saved." Matthew 10:22, Mark 13:13
"Because of the increase of wickedness, the love of most will grow cold, but he who endures to the end will be saved." Matthew 24:12-13
"To the Jews who had believed Him, Jesus said, 'IF you hold to My teaching, you are really My disciples.'" John 8:31
"If anyone does not remain in Me, he is like a branch that is thrown away and withers; such branches are picked up, thrown into the fire and burned." John 15:6
"By this gospel you are saved, IF you hold firmly to the word I preached to you. Otherwise, you have believed in vain." 1 Corinthians 15:2
"IF you continue in your faith, established and firm, not moved from the hope held out in the gospel." Colossians 1:23
"We have come to share in Christ IF we hold firmly till the end the confidence we had at first." Hebrews 3:14
"To him who overcomes, I will give the right to eat from the tree of life, which is in the paradise of God." Revelation 2:7
"Be faithful, even to the point of death, and I will give you the crown of life." Revelation 2:10
"To him who overcomes, I will give the right to sit with Me on My throne" Revelation 3:21
Part 2. The NECESSITY of God's Preservation
"This is the will of Him who sent Me, that I shall lose none of all that He has given Me, but raise them up at the last day." John 6:39
"I give them eternal life, and they shall never perish; no one can snatch them out of My hand." John 10:28
"For I am convinced that neither death nor life, neither angels nor demons, neither the present nor the future, nor any powers, neither height nor depth, nor anything else in all creation--will be able to separate us from the love of God that is in Christ Jesus our Lord." Romans 8:38-39
"Being confident of this, that He who began a good work in you, will carry it on to completion until the day of Christ Jesus." Philippians 1:6
"The Lord will rescue me from every evil attack, and will bring me safely to His heavenly kingdom." 2 Timothy 4:18
"Who are kept by the power of God through faith for salvation" 1 Peter 1:5
"To Him who is able to keep you from falling, and to present you before His glorious presence without fault and with great joy" Jude 24
Summary
God will preserve all of His chosen, redeemed and regenerate people in the faith and in a holy life.
All of God's chosen, redeemed, and regenerate people, will persevere in the faith and in a holy life--not perfectly, but purposely.