Jesus had arrived in Jerusalem on the Friday before He was crucified. We call this day "Good Friday". As He entered Jerusalem, the people began to spread their coats over the road in front of Him. They were also praising God for everything that Jesus had done.
When the Pharisees heard of this, they told Jesus to rebuke his disciples for what they were doing. However, Jesus did just the opposite. He rebuked the Pharisees! Jesus replied to their empty words with the comment that, if His disciples stopped praising God, the stones would cry out! This is very true.
Scripture reveals to us that God, in His infinite wisdom, designed nature so that we could see His "invisible attributes" (Rom. 1:20). We can know that God is the Almighty Creator of the universe by looking at the universe. We can know that God is our Creator by looking at the human body. Nature will point us to God if we look at it.
This is why it is important for Christians to study nature. It is truly a blessing to be able to study God's creation. Since the study of nature will ultimately point to God, it may provide an important means of evangelism. We can reach the lost by leading them, logically, from things in nature to God. We have nothing to lose by reaching out in this way.