“Other possible echoes of the parable are in 1 Thes 1:6 and 2:13. Paul speaks in 1:6 of the Thessalonians as ‘imitators of us and of the Lord, for in spite of persecution you received the word with joy inspired by the Holy Spirit’ and in 2:13 of them accepting ‘the heard word’ (literally ‘the word of hearing’) as the word of God. The similarity to the parable of the sower, as it is interpreted in the Gospels, is notable: We find in common
* the theme of ‘the word,’ that is, the word of God at work in people,
* an emphasis on ‘hearing’ (cf. Rom 10:14-17),
* the idea of ‘receiving) the word, and
* an association of hearing with both ‘joy’ and ‘tribulation,’ the same Greek words being used in 1 Thessalonians and the synoptics.”
(David Wenham, Paul: Follower of Jesus or Founder of Christianity?, p. 87)
Paul sounds like Jesus. Paul acts like Jesus, seeing how the new believers are doing with the gospel they have heard: Is the seed planted in them producing fruit?