Scripture, Evangelism, and Divine Sovereignty

This weekend I read J.I. Packer's work, Evangelism and the Sovereignty of God. The cumulation of my thoughts concerning the book are as follows.

Even though God's total sovereignty and the command to do evangelism are seemingly at odds, they are both taught in Scripture. Therefore, no one can claim the Bible as the ultimate authority and then state that God is not totally sovereign or Christians need not evangelize. If an individual denies God’s sovereignty or the mandate to evangelize, then he or she has proven that he or she does not view Scripture as authority, but rather his or her own logic.