Psalms 126:6 (ESV)
He who goes out weeping,
bearing the seed for sowing,
shall come home with shouts of joy,
bringing his sheaves with him.
This section of the psalms are songs that were song when the people of Israel would go to the Temple for worship during one of the feast times. They were songs of rejoicing and praise and worship. In the above line we find one of the precious of all certainties of God’s word. It states that those who take God’s word (the seed) and go in the compassion of the Spirit to sow the seed, will most assuredly come back with blessings. This called the law of the harvest. Paul used it to warn the Galatians of the negative side of the law of the harvest by stating it this way:
Galatians 6:7 (ESV)
Do not be deceived: God is not mocked, for whatever one sows, that will he also reap.
He went on to add the positive side of it:
Galatians 6:8 (ESV)
For the one who sows to his own flesh will from the flesh reap corruption, but the one who sows to the Spirit will from the Spirit reap eternal life.
When we sow in the Spirit we will reap from the Spirit eternal life. That is the above song of the ascents. God wants us to know as we seek to worship Him in the Spirit we will return from that worship with abundant blessings. That blessing may not be characterized in the way we always think, however. God gives us eternal blessings for what we reap in the Spirit. We don’t see them like we might think, or want, or expect. But that does not diminish the truth of the above verse. We are to reap with passion the seed God gives us. It is His choice how He decides what type “sheaves” look like that we reap from that sowing.