Spiritual maturity is a gradual process. You can be sure that there will be a harvest. There will be a harvest. There will be a harvest. Only in Mark.
Christian maturity is when the word is received, believed and obeyed, then the believer grows.
This fits in with the Lord's return and God's program. The same man who did the sowing will do the reaping. The wheat and tares are gathered together, then put into the barn or discarded. If we scatter the seed, there will be results. People will be saved and disciples will be made.