A Christians engagement with God is many times like our engagement with the snooze button on our alarm clocks - we want to put off the vital encounter with the Sovereign king of creation. God now was leading them into the promise land that he had GIVEN to them. Their possession of it was a certainty and not because of their abilities. We may talk a good talk but when it comes to actively following God's calling we hesitate for several reasons. I call these reasons, "challenges to God calling" and there are three of them in Numbers 13-14.
First there is the challenge to our dependence on God. God put the people to a test when he sent out 12 men to spy out the promise land. It was a test but it was also the way God created a desire for his will. He created desire for the land that was flowing with milk and honey by showing them it, the same way a father would create a desire for a bike that he already bought his son for his birthday by showing him one in the store beforehand. God was teaching his people to depend on Him all the time for all things in all situations. Jesus did not come to be served... (Mark 10:45) at least not in the way we thing. We only serve Christ in the strength that he gives (1 Peter 4:10-11). God is always the benefactor and we are always the beneficiaries. We are absolutely dependent on God.
The Second challenge to God's calling is to our vision of God. Is our vision of God man centered or God centered. 10 of the spies came back with a bad report because they had a wrong vision of God, and a wrong vision of humanity. They only looked at their own resources when God is the Benefactor and there were the beneficiaries; when God is the dependable one and they are in need, and when God is the King and they were the subjects.
And Finally the third challenge to God's calling is to our obedience to God himself. In Chapter 14 we find that God judged the Nation of Israel because of the hesitation and disobedience. He does the same today. Delayed obedience is disobedience and disobedience will bring God discipline upon his people including death.
God is calling some of you generally as he does with every one to repent of sins and believe in your creator through the death of Jesus Christ. God is also calling some of you in a way that overcomes your resistance to him (he is taking away that snooze button) by challenging or proving your dependence, vision, and obedience to Him. Either you will live in the domain of darkness or in the domain of light which is the domain of Jesus Christ.