In Mark 7, we find Jesus performing a great miracle. The whole dramatic scene takes place in just five verses:
"Departing from the coasts of Tyre and Sidon, he came unto the sea of Galilee, through the midst of the coasts of Decapolis. And they bring unto him one that was deaf, and had an impediment in his speech; and they beseech him to put his hand upon him. And he took him aside from the multitude, and put his fingers into his ears, and he spit, and touched his tongue; and looking up to heaven, he sighed, and saith unto him, Ephphatha, that is, Be opened. And straightway his ears were opened, and the string of his tongue was loosed, and he spoke plain" (Mark 7:31-35).
Picture the scene. As Jesus arrived on the shores of Decapolis, he encountered a man who was both deaf and tongue-tied. The man could talk, but his speech was unintelligible. Christ took the man aside, away from the crowd, and as He stood before the man, He placed His fingers in his ears. Then Jesus spat, and touched his tongue, speaking two words: "Be opened!" And instantly, the man could hear and speak clearly.
Just prior to this scene, Jesus had also delivered a woman's demon-possessed daughter. By merely speaking a word, He cast the evil spirit out of the girl. Why are these two miracles recorded in Scripture? Are they included as just two more scenes from the Lord's life on earth?
The vast majority of Christians believe such stories are preserved in Scripture because they reveal much to us. They are intended to show God's power over Satan and sickness. They're meant as proof of Christ's deity, to establish that He was God in flesh. And they're meant to encourage our faith, to show us that our God can work miracles.
I believe these stories were recorded for all these reasons, and much more. Jesus tells us every word He spoke came from the Father. He said and did nothing on His own, but by His Father's leading. Moreover, every event of Christ's life holds a lesson for us (see 1 Corinthians 10:11).