In 1 John 3:21, if our heart does not condemn us, we have confidence — building directly on the reassurance from the previous verse.

In 1 John 3:14, assurance of passing from death to life is grounded in love for brothers — the same love in deed from the previous verse.

1 John 2:3 uses the same 'by this we know' formula about keeping commandments, reinforcing the theme of assurance through obedience.

1 John 4:17 speaks of confidence for judgment day, expanding the assurance theme from present heart reassurance to future confidence.

In 1 John 1:8, claiming sinlessness deceives ourselves and denies truth — contrasting with the assurance of being of the truth here.

In John 18:37, Jesus says everyone 'of the truth' listens to him — the exact phrase used here for assurance.

Hebrews 10:22 calls for full assurance of faith with a true heart — directly paralleling the reassurance of heart here.

In Hebrews 6:11, the full assurance of hope echoes the same heart reassurance — both aim for confident faith before God.

2 Timothy 1:12 shows Paul's personal conviction 'I know whom I have believed' — the same settled confidence that reassures our heart.

Romans 8:38 expresses Paul's unwavering certainty of God's love — a profound echo of the assurance that calms our heart.

In John 13:35, love for one another is the sign of discipleship, paralleling the assurance of being of the truth through love in this verse.

2 Peter 1:10 urges confirming your calling and election, directly paralleling the desire to know we are 'of the truth' here.

Colossians 2:2 directly speaks of 'full assurance of understanding,' echoing the confident knowledge of being 'of the truth' in 1 John.

Romans 8:16 has the Spirit bearing witness with our spirit that we are God's children—parallel to heart assurance of being of the truth in 1 John.

In Hebrews 6:10, God remembers love shown in service to saints — echoing the theme of love in deed as evidence of truth.

Hebrews 10:19 speaks of confidence to enter the holy place, complementing the heart reassurance before God found in 1 John.

Hebrews 11:13 portrays the patriarchs' confident faith in promises unseen — a similar assurance of being on the right path.

Romans 4:21 describes Abraham fully convinced of God's promise — a similar confident persuasion that assures the heart.