What is the difference between eternal security, once saved always saved, and perseverance of the saints?

[mailmandan]

Perfect love casts out fear

I serve and obey God out of love not fear. When I was a young believer it was fear driven.

Prior to my conversion several years ago while still attending the Roman Catholic church, I basically saw God as a tyrant who couldn't wait to punish me every time I messed up and throw me into hell for not being "good enough." That is an unhealthy fear which is not from above!

As a born again Christian, I now have
a healthy fear of offending God through disobedience and a righteous awe and respect or reverence for Him. (Proverbs 1:7; Psalm 2:11; Psalm 34:9; Isaiah 66:2) In Philippians 2:12, we are told to work out our salvation with fear and trembling.

Paul uses the same phrase "fear and trembling" in 2 Corinthians 7:15 in which he refers to Titus as being encouraged by the reception of him by the Corinthians "with fear and trembling," that is, with humility and respect for his position as a minister of Jesus Christ.

In 1 Corinthians 2:3, we see that Paul himself came to the Corinthian church in "weakness and fear, and with much trembling" in regard to the huge responsibility and critical importance of the work in which he was engaged.

 

[civic]

1 John 4:18
There is no fear in love - Love is not an affection which produces fear. In the love which we have for a parent, a child, a friend, there is no fear. If a man had perfect love to God, he would have no fear of anything - for what would he have to dread? He would have no fear of death, for he would have nothing to dread beyond the grave. It is guilt that makes people fear what is to come; but he whose sins are pardoned, and whose heart is filled with the love of God, has nothing to dread in this world or the world to come. The angels in heaven, who have always loved God and one another, have no fear, for they have nothing to dread in the future; the redeemed in heaven, rescued from all danger, and filled with the love of God, have nothing to dread; and as far as that same loves operates on earth, it delivers the soul now from all apprehension of what is to come.
But perfect love casteth out fear - That is, love that is complete, or that is allowed to exert its proper influence on the soul. As far as it exists, its tendency is to deliver the mind from alarms. If it should exist in any soul in an absolutely perfect state, that soul would be entirely free from all dread in regard to the future.

Because fear hath torment - It is a painful and distressing emotion. Thus men suffer from the fear of poverty, of losses, of bereavement, of sickness, of death, and of future woe. From all these distressing apprehensions, that love of God which furnishes an evidence of true piety delivers us.

He that feareth, is not made perfect in love - He about whose mind there lingers the apprehension of future wrath, shows that love in his soul has not accomplished its full work. Perhaps it never will on any soul until we reach the heavenly world, though there are many minds so full of love to God, as to be prevailingly delivered from fear.barnes

cross references

Romans 8:15
For you did not receive a spirit of slavery that returns you to fear, but you received the Spirit of adoption to sonship, by whom we cry, “Abba! Father!”

2 Timothy 1:7
For God has not given us a spirit of fear, but of power, love, and self-control.

John 14:27
Peace I leave with you; My peace I give to you. I do not give to you as the world gives. Do not let your hearts be troubled; do not be afraid.

Philippians 4:6-7
Be anxious for nothing, but in everything, by prayer and petition, with thanksgiving, present your requests to God. / And the peace of God, which surpasses all understanding, will guard your hearts and your minds in Christ Jesus.

hope this helps !!!