Simon, etc. - See on Matthew 10:2 (note), etc.

And Simon he surnamed Peter. Or Cephas, which signifies a rock, or stone, because of his courage and constancy, his strength and fortitude, steadiness and firmness of mind: this name was imposed upon him, not at the time of his mission as an apostle; nor when he made that noble confession of his faith in Christ, as the Son of the living God, at which time this name was taken notice of; but when Christ first called him to be his disciple and apostle; see John 1:42.

And Simon he surnamed Peter

Mark relates only his naming and not his appointment, leaving his appointment to be understood.

And Simon he surnamed Peter;

3:16 Simon he surnamed Peter. He did this previously (Joh 1:42).

3:16 He surnamed them sons of thunder - Both with respect to the warmth and impetuosity of their spirit, their fervent manner of preaching, and the power of their word.

3:13-21 Christ calls whom he will; for his grace is his own. He had called the apostles to separate themselves from the crowd, and they came unto him. He now gave them power to heal sicknesses, and to cast out devils. May the Lord send forth more and more of those who have been with him, and have learned of him to preach his gospel, to be instruments in his blessed work. Those whose hearts are enlarged in the work of God, can easily bear with what is inconvenient to themselves, and will rather lose a meal than an opportunity of doing good. Those who go on with zeal in the work of God, must expect hinderances, both from the hatred of enemies, and mistaken affections of friends, and need to guard against both.