Saying yes to God can be hard. Most of the time, it requires courage. Sometimes, it means following God in ways others don't understand or always agree.

We won't always understand what God is doing. 

In Matthew 16, Jesus commended Peter for his spiritual discernment. Peter identified Jesus as the Messiah, the Son of the living God. But four verses later, when Jesus' predicted His death and resurrection, Peter rebuked Jesus. "Never, Lord!..." This shall never happen to you!" (Matthew 16:22)

I can only imagine how stunned Peter must have been to hear, "Get behind me, Satan! You are a stumbling block to me; you do not have in mind the concerns of God, but merely human concerns." (Matthew 16:23) 

The truth is sometimes, like Peter, godly people give ungodly advice.