Elijah had the assurance that there would be no rain for three and a half years. By the gift of faith, he had assurance that it would rain when he asked for rain, even though he couldn't see the rain. By the gift of faith, Elisha had the assurance that the victory would be won in the camp the day before the natural eyes saw it come to pass. Paul knew by a divine revelation that no man would lay hands on him to do him harm. He acted accordingly.
Real faith is trust.
You will walk out on it. Since that was an answer to prayer it must have been faith before he saw it. It is usually best not to tell your assurance to others before you see the answer and have natural evidence that natural man can understand.