Assurance is to be stable

“These things have I written unto you that believe on the name of the Son of God; that ye may know that ye have eternal life, and that ye may believe on the name of the Son of God.”

“Let us draw near with a true heart in full assurance of faith, having our hearts sprinkled from an evil conscience, and our bodies washed with pure water.”

2 Timothy 1:2,12 KJV

[2] To Timothy, my dearly beloved son: Grace, mercy, and peace, from God the Father and Christ Jesus our Lord. [12] For the which cause I also suffer these things: nevertheless I am not ashamed: for I know whom I have believed, and am persuaded that he is able to keep that which I have committed unto him against that day.

“Verily, verily, I say unto you, He that believeth on me hath everlasting life.”

“And the work of righteousness shall be peace; and the effect of righteousness quietness and assurance for ever.”