Here’s a concise, evangelical Christian summary about the most-likely author of 2 Thessalonians 1:3.

Text (ESV)
– 2 Thessalonians 1:3 — “We ought always to give thanks to God for you, brothers, since your faith is growing abundantly, and the love of every one of you for one another is increasing.”

Author (evangelical perspective)
– Primary author: the Apostle Paul. The letter opens “Paul, Silvanus, and Timothy,” which in the New Testament convention indicates Paul as the principal sender with Silvanus (Silas) and Timothy as co-workers who join in the greeting (cf. 1 Thess. 1:1; other Pauline letters).
– Evangelical scholars generally affirm Pauline authorship and apostolic authority for 2 Thessalonians. They treat it as an authentic letter written by Paul to the church in Thessalonica.

Why evangelicals accept Paul as author
– Internal testimony: Paul names himself in the greeting and writes in a personal, pastoral style that fits his other epistles (thanksgiving, doctrinal and pastoral sections, closing benediction, personal remarks).
– Historical attestation: Early church writers accepted 2 Thessalonians as canonical and Pauline.
– Theological and pastoral continuity: Key themes (perseverance under persecution, eschatology, pastoral correction) fit Paul’s known concerns for the Thessalonian churches.
– Practical explanations for differences from 1 Thessalonians: Evangelicals often explain stylistic or emphatic differences as reflecting different occasions, purposes, or the involvement of different secretaries/assistants (amanuenses), not pseudonymous authorship.

Date and context (typical evangelical dating)
– Date: commonly placed in the mid-50s AD, soon after 1 Thessalonians.
– Place: likely written from Corinth during Paul’s second missionary journey or shortly thereafter.
– Occasion: encouragement under persecution and correction of misunderstandings about the coming of the Lord (the “Day of the Lord”).

Who are Silvanus and Timothy?
– Silvanus (Silas) and Timothy are longstanding companions of Paul and often named as co-senders in his letters. Their presence underscores the letter’s pastoral, communal origin and grounds it in Paul’s missionary team.

How 2 Thess 1:3 fits Paul’s pastoral style
– It exemplifies Paul’s characteristic opening: a thankful prayer/commendation for the recipients (cf. many Pauline letters).
– It balances theological emphasis (faith and love) with pastoral encouragement—typical of Paul’s concern for the spiritual growth and mutual love of the churches he planted.

Suggested resources (evangelical-friendly)
– Leon Morris, The First and Second Epistles to the Thessalonians (Tyndale/New International Commentary)
– F. F. Bruce, The Epistles to the Thessalonians
– D. A. Carson, commentaries and articles on Pauline authorship and theology

If you’d like, I can:
– Summarize arguments used by critical scholars who question Pauline authorship and respond from an evangelical standpoint, or
– Give a short exegesis of 2 Thessalonians 1:3 in its immediate context.