What is meant by the term 'effectual' in relation to the gospel?

The term 'effectual' highlights the power of the gospel to bring about genuine change in the lives of believers. In the sermon, Cunningham describes effectual as getting the job done. This means that when God speaks through His word, His purposes are fulfilled without fail. As seen in scripture, particularly in 2 Corinthians 4:6, God's command to bring light into darkness exemplifies His authoritative word that turns hearts toward Him. This aspect of the gospel ensures that it not only informs but effectively transforms those who hear and accept it with faith.