For in the feast of Pentecost, the first fruits of all the harvest were carried into the temple and waved before the Lord. 37 And herein is that saying true, One soweth, and another reapeth. An illustration based upon their common knowledge of farming. Sowers are essential. Seed must be sown, else there is no harvest.
Reapers are essential.
If the harvest is not brought in the crop is wasted. Sowers and reapers may be interchangeable, sowing in one place and reaping in another. The goal is the harvest and both reaper and sower rejoice when the harvest is gathered. On seeing and hearing our Lord, the faith of those who had already believed on the woman's testimony was abundantly confirmed. And, beside those, many others believed who had not heard the woman speak.