Passage
for the truth's sake which abides in us and shall be with us to eternity.
for the truth's sake which abides in us and shall be with us to eternity.
2 John 1:1 The elder to [the] elect lady and her children, whom *I* love in truth, and not *I* only but also all who have known the truth,
2 John 1:2 for the truth's sake which abides in us and shall be with us to eternity.
2 John 1:3 Grace shall be with you, mercy, peace from God [the] Father, and from [the] Lord Jesus Christ, the Son of the Father, in truth and love.
2 John 1:4 I rejoiced greatly that I have found of thy children walking in truth, as we have received commandment from the Father.
The verse centers on "truth's", "sake", "abides", "shall", and "eternity". It is saying that the verse draws attention to "truth's" and "sake", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 1's "The elder to the elect lady and..." into verse 3's "Grace shall be with you mercy peace...", so "truth's" and "sake" belong inside that flow. In 2 John context, the local focus is Christ, faith, and discipleship.
A plain takeaway is to answer the verse's own emphasis on "truth's" and "sake" with trust shaped by these words, not by a vague optimism outside the passage.