Andrew Murray emphasizes that while certain things may seem impossible for men and women, they are entirely possible with God. He encourages believers to seek and welcome revival, highlighting the promise of the Holy Spirit as a source of power for the church to fulfill its mission. Murray asserts that this divine empowerment is the heritage of the church, contingent upon its willingness to claim it. The sermon calls for readiness among God's people to embrace this promise and act as witnesses to the world.