" Simon said: "Thou art Christ, the Son of the living God".
Simon settled in Capharnaum, where he was living with his mother-in-law in his own house (Matthew ; Luke ) at the beginning of Christ's public ministry (about A. Simon pursued in Capharnaum the profitable occupation of fisherman in Lake Genesareth, possessing his own boat (Luke 5:3).
Like so many of his Jewish contemporaries, he was attracted by the Baptist's preaching of penance and was, with his brother Andrew, among John's associates in Bethania on the eastern bank of the Jordan.
On the same occasion the sons of Zebedee were called (Matthew -22; Mark -20; Luke 5:1-11; it is here assumed that Luke refers to the same occasion as the other Evangelists).
Thenceforth Peter remained always in the immediate neighbourhood of Our Lord.
The more prominent the Apostles become in the Evangelical narrative, the more conspicuous does Peter appear as the first among them. et imposuit Simoni nomen Petrus"; Luke -14: "Et cum dies factus esset, vocavit discipulos suos, et elegit duodecim ex ipsis (quos et Apostolos nominavit): Simonem, quem cognominavit Petrum . ." On various occasions Peter speaks in the name of the other Apostles (Matthew ; ; Luke , etc.).
In the list of the Twelve on the occasion of their solemn call to the Apostolate, not only does Peter stand always at their head, but the surname given him by Christ is especially emphasized (Matthew 10:2): "Duodecim autem Apostolorum nomina haec: Primus Simon qui dicitur Petrus. ."; Mark -16: "Et fecit ut essent duodecim cum illo, et ut mitteret eos praedicare . When Christ's words are addressed to all the Apostles, Peter answers in their name (e.g., Matthew ).
And whatsoever thou shalt bind upon earth, it shall be bound also in heaven: and whatsoever thou shalt loose on earth, it shall be loosed also in heaven".
Then he commanded his disciples, that they should tell no one that he was Jesus the Christ (Matthew -20; Mark -30; Luke -21).
After preaching the Sermon on the Mount and curing the son of the centurion in Capharnaum, Jesus came to Peter's house and cured his wife's mother, who was sick of a fever (Matthew -15; Mark -31).
A little later Christ chose His Twelve Apostles as His constant associates in preaching the kingdom of God. Though of irresolute character, he clings with the greatest fidelity, firmness of faith, and inward love to the Saviour; rash alike in word and act, he is full of zeal and enthusiasm, though momentarily easily accessible to external influences and intimidated by difficulties.
Already, at this first meeting, the Saviour foretold the change of Simon's name to Cephas () a proof that Christ had already special views with regard to Simon.