Thanks for your concern, but I am willing to take my chances with assurance of salvation. It is the cause of a lot of peace in my life. Anyone can have it.
Christians are not bragging about the security of their salvation. We realize it stems from nothing we've done or can do.
We know that our sins were forgiven at a very, very high immeasurable cost through the shed blood of Christ. Colossians tells us He has wiped away all of our sins having nailed them to the cross.
We know we are not perfect in any stretch.
We also know it is through Him and Him only, due to His grace that we have salvation because we have believed....much as the disciples did as noted in John 6.