What does the Bible say about the message of evangelism?

The Bible presents a two-fold message of evangelism: first, that 'All flesh is grass,' indicating the temporality and frailty of humanity (Isaiah 40:6-8). This emphasizes that in and of ourselves, we are worthless before God, as even our righteousness is likened to filthy rags. Second, we are called to 'behold your God,' showcasing His power, sovereignty, and the good news of salvation through Jesus Christ. The message serves to remind believers to rely upon God, who offers strength and salvation, rather than on their own efforts.