Marcos 11:24

“Therefore I say to you, All things whatever you pray and ask for, believe that you have received them and you will have them”.

This and the following verse could well be a teaching of Jesus which Mark knew of and put here in order to provide it with a context. It could be seen as a more general saying rather than as fitting the context directly. In that case it is a promise to the dedicated follower of Christ that whenever, in His service for God, he or she has a great need, they can come with confidence to the Father to meet that need. But note that their spiritual state must be such that they can come with confident faith. Then their confidence will be reflected by the certainty that they have that their prayer will be answered, and thus it will be. This is no promise to be used lightly for personal benefit or for trivialities. It is for those who are seeking first the Kingly Rule of God and His righteousness.

But again it is difficult to avoid the conclusion that its context indicates that included in the idea of the response to faith as exemplified here was what Jesus had Himself demonstrated, that just as the fig tree had withered at His word, so also finally will the Temple.