Early in the morning, as He was returning to the city, He was hungry. Seeing a lone fig tree by the road, He went up to it and found nothing on it except leaves. And He said to it, “May no fruit ever come from you again!” At once the fig tree withered.
When the disciples saw it, they were amazed and said, “How did the fig tree wither so quickly?”
Jesus answered them, “I assure you: If you have faith and do not doubt, you will not only do what was done to the fig tree, but even if you tell this mountain, ‘Be lifted up and thrown into the sea,’ it will be done. And if you believe, you will receive whatever you ask for in prayer.”
(Matthew 21:18-22 Holman Christian Standard Bible ®©)
I believe that Jesus was talking to the disciples about a dynamic, and not just something that was promised to them alone. I believe that if we allow the Holy Spirit to bear in us the fruit of fullness of faith (Galatians 5:22-23), that such fullness can speak to a fig tree or a mountain or anything else and order it around.
I have been wrong about other things, so it is quite possible that I am wrong about this. I would rather, though, on the day I stand to be judged by Jesus, have Him ask me why I asked for so many miracles than to have Him ask me why I didn’t ask for more. The judgement I currently experience from humans who think I’m foolish has no strength compared to that Day.