And when the disciples saw it, they marveled, saying, “How did the fig tree wither away so soon?”
21 So Jesus answered and said to them, “Assuredly, I say to you, if you have faith and do not doubt, you will not only do what was done to the fig tree, but also if you say to this mountain, ‘Be removed and be cast into the sea,’ it will be done. 22 And whatever things you ask in prayer, believing, you will receive.” – Matthew 21:20-22.
This has deep biblical, Jewish and symbolic significance but Jesus’ immediate lesson is that Christians exercising faith (which can only ever be validly exercised in accordance with a desire to see God glorified and His will done) will see greater things done. Mountains can be removed and cast into the sea. Many have found that their gracious and faithful God answers prayer and has removed mountains in their lives.