......is assurance of salvation essential?
Hello Xeno of Athens, while the assurance of salvation is meant as a gift and a blessing to every believer in this life as something that God clearly wants us to have & experience (and even commands us to be certain of), having such assurance is not an essential part of being saved.
1 John 5
13 These things I have written to you who believe in the name of the Son of God, so that you may ~know~ that you have eternal life.
2 Corinthians 13
5 Test yourselves to see if you are in the faith; examine yourselves! Or do you not recognize this about yourselves, that Jesus Christ is in you—unless indeed you fail the test?
On the one hand, there will be many who will die with the assurance that they truly were believers (because of all the great and miraculous works that they believed they did in His Name, for instance) but who will, in the end, find themselves condemned (because He never knew them, nor they, Him .. cf
John 17:3).
Matthew 7
22 Many will say to Me on that day, ‘Lord, Lord, did we not prophesy in Your name, and in Your name cast out demons, and in Your name perform many miracles?’
23 And then I will declare to them, ‘I never knew you; DEPART FROM ME, YOU WHO PRACTICE LAWLESSNESS.’
Then, on the other hand, there will be those who die with little to no assurance that they were truly saved, but they will find themselves standing with the rest of the saints at the Bema Seat of Christ at the end of the age (instead of with the reprobates at the Great White Throne), nevertheless .. e.g.
1 Corinthians 3:10-15).
So, while assurance is valuable gift and blessing that God wants us to have, it should not be considered as something which is "essential" to our salvation.
God bless you!!
--David