Psalm 100:5 For the Lord is good; His mercy is everlasting, And His truth endures to all generations.
Jesus is described as being our Good Shepherd because a good shepherd will continue to look after their flock no matter what happens.
Jesus loves us and wants to take care of us. In order to allow Him to do that we do have to submit to Him so that He can care for us.
We have thousands of years of proof that God continues to care for us and have mercy on us. How much more proof do we need that He is our Lord and Saviour who cares!