The apostles said to the Lord, “Increase our faith!”

And the Lord answered, “If you have faith the size of a mustard seed, you can say to this mulberry tree, ‘Be uprooted and planted in the sea,’ and it will obey you.

“What do you want Me to do for you?” “Lord,” he said, “let me see again.”

Truly, truly, I tell you, whoever believes in Me will also do the works that I am doing. He will do even greater things than these, because I am going to the Father.

Then Peter sent them all out of the room. He knelt down and prayed, and turning toward her body, he said, “Tabitha, get up!” She opened her eyes, and seeing Peter, she sat up.

“You are out of your mind,” they told her. But when she kept insisting it was so, they said, “It must be his angel.”

She continued this for many days. Eventually Paul grew so aggravated that he turned and said to the spirit, “In the name of Jesus Christ I command you to come out of her!” And the spirit left her at that very moment.

If I have the gift of prophecy and can fathom all mysteries and all knowledge, and if I have absolute faith so as to move mountains, but have not love, I am nothing.

So we see that it was because of their unbelief that they were unable to enter.

Elijah was a man just like us. He prayed earnestly that it would not rain, and it did not rain on the land for three and a half years.