Theophylact of Ohrid
Catena Aurea · Markusevangelium 11
And when even was come, he went out of the city. And in the morning, as they passed by, they saw the fig tree dried up from the roots. And Peter calling to remembrance saith unto him, Master, behold, the fig tree which thou cursedst is withered away. And Jesus answering saith unto them, Have faith in God. For verily I say unto you, That whosoever shall say unto this mountain, Be thou removed, and be thou cast into the sea; and shall not doubt in his heart, but shall believe that those things which he saith shall come to pass; he shall have whatsoever he saith. Therefore I say unto you, What things soever ye desire, when ye pray, believe that ye receive them, and ye shall have them. And when ye stand praying, forgive, if ye have ought against any: that your Father also which is in heaven may forgive you your trespasses. But if ye do not forgive, neither will your Father which is in heaven forgive your trespasses.
For whosoever sincerely believes evidently lifts up his heart to God, and is joined to Him, and his burning heart feels sure that he has received what he asked for, which he who has experienced will understand; and those persons appear to me to experience this, who attend to the measure and the manner of their prayers. For this reason the Lord says, Ye shall receive whatsoever ye ask in faith; for he who believes that he is altogether in the hands of God, and interceding with tears, feels that he as it were has hold of the feet of the Lord in prayer, he shall receive what he has rightly asked for. Again, would you in another way receive what you ask for? Forgive your brother, if he has in any way sinned against you; this is also what is added: And when ye stand praying, forgive, if ye have ought against any: that your Father also which is in heaven may forgive you your trespasses.