Murmuring or complaining may seem pretty harmless, but don't be deceived. It is a sin to murmur against God. Murmuring and complaining delayed the destiny of the children of Israel. When you complain, you are in essence questioning the goodness of God.
This sermon challenges us to do everything without murmuring and complaining, to praise God in our pain and to keep our eyes focused on God. When we do this, God gives us divine speed and hastens His word to perform it.
Listen and be encouraged.