"On the next day, when they had left Bethany, He became hungry. Seeing at a distance a fig tree in leaf, He went to see if perhaps He would find anything on it; and when He came to it, He found nothing but leaves, for it was not the season for figs. He said to it, "May no one ever eat fruit from you again!" And His disciples were listening. (Mark 11:12-14)
The next day....
"As they were passing by in the morning, they saw the fig tree withered from the roots up. Being reminded, Peter said to Him, "Rabbi, look, the fig tree which You cursed has withered." And Jesus answered saying to them, "Have faith in God. Truly I say to you, whoever says to this mountain, "Be taken up and cast into the sea, and does not doubt in his heart, but believes that what he says is going to happen, it will be granted him. Therefore I say to you, all things for which you pray and ask, believe that you have received them, and they will be granted you." (Mark 11:20-24)
Jesus knew fully what God was able to do and He prayed with that faith.
We can also learn a lot about the mighty God we serve and be more aware of what He will do. Then hopefully we will learn to pray to Him with complete faith.
Lord increase my faith!