15 “Friends, why are you doing this? We too are only human, like you. We are bringing you good news, telling you to turn from these worthless things to the living God, who made the heavens and the earth and the sea and everything in them. 16 In the past, he let all nations go their own way. 17 Yet he has not left himself without testimony: He has shown kindness by giving you rain from heaven and crops in their seasons; he provides you with plenty of food and fills your hearts with joy.” 18 Even with these words, they had difficulty keeping the crowd from sacrificing to them.
“Responding to the people of Lystra, Paul and Barnabas reminded them that God never leaves himself ‘without testimony.’ Rain and crops, for example, are evidence of his goodness. Later Paul wrote that this evidence in nature leaves people without an excuse for unbelief (Romans 1:20). When in doubt about God, look around and you will see abundant evidence that he is at work in the world.” (Life Application Study Bible 1835)
Life Application Study Bible. Zondervan, 2011. p. 1835.