Why is the success of gospel ministry attributed to God?

In Luke 9, we see Jesus empowering the disciples, and upon their return, they celebrate the successes they experienced in His name. However, it is crucial to remember, as Paul writes in 1 Corinthians 3:7, that neither he who plants nor he who waters is anything, but it is God who gives the increase. This humility in recognizing that all success belongs to God serves as a reminder that any impact made through preaching is a result of His grace and power working through sinful vessels. This perspective fosters dependence on the Holy Spirit and encourages preachers to give all glory to God.