John Calvin Commentary Philippians 4:1

"Wherefore, my brethren beloved and longed for, my joy and crown, so stand fast in the Lord, my beloved." — Philippians 4:1 (ASV)

Therefore, my brethren He concludes his doctrine, as he usually does, with most urgent exhortations, so that he may establish it more firmly in people's minds. He also appeals to their affections with endearing terms of address, which at the same time are not motivated by flattery, but by sincere affection. He calls them his joy and crown; because, delighted to see those who had been gained over through his ministry persevering in the faith, he hoped to attain that triumph, which we have mentioned before, when the Lord will reward with a crown those things that have been accomplished under His guidance.

When he urges them to so stand fast in the Lord, he means that he approves of their condition. At the same time, the word so might be taken as referring to the preceding doctrine; but the first interpretation is more suitable, so that, by praising their current condition, he urges them to perseverance. They had already, it is true, given some evidence of their steadfastness. Paul, however, knowing well human weakness, considers that they need strengthening for the future.