Undesigned coincidence: 1 Corinthians 4 and Acts 19 — Timothy's route to Corinth

1 Corinthians 4:17 — Paul says he has already sent Timothy to Corinth. 1 Corinthians 16:10 — Paul expects his letter to arrive before Timothy does, even though Paul is writing from Ephesus (confirmed by greetings from Aquila and Priscilla in 1 Cor 16 — they traveled with Paul from Corinth to Ephesus, Acts 18). The most natural route from Ephesus to Corinth would be by boat across the Aegean Sea; yet Paul expected his letter to beat Timothy there. Acts 19:21-22 — Paul sends Timothy and Erastus through Macedonia (the overland route) before heading to Achaia (Corinth). This explains precisely why Timothy takes longer — he went the indirect overland route through Macedonia. Acts never explains why Paul's letter would arrive first; 1 Corinthians never explains Timothy's route — but together they form a coherent picture.