“Fear not, little flock; for it is your Father’s good pleasure to give you the kingdom.”
People must claim loyalty to God at all times. It is highly important to understand this premise. If certain things that are less than humans receive provision from the Lord, then His People ought to know that they will be provided for, and even more will receive the spiritual Kingdom that He has prepared for us. It is His pleasure to give us the Kingdom of God.
Of course, giving this thought to fishermen was probably to them quite a surprise. Instead of trying to conquer a kingdom on Earth for themselves, Jesus was offering them a spiritual Kingdom, so they realize they do not have to overwork themselves trying to fulfill a kingdom on Earth. Working for God’s Kingdom allows one to be in greater rest while helping others.
The Lord is instructing simply that His Disciples are heirs to the Heavenly Kingdom where their treasures are.