Passage
And, walking by the sea of Galilee, he saw Simon, and Andrew his brother, casting a drag into the sea, for they were fishers,
And, walking by the sea of Galilee, he saw Simon, and Andrew his brother, casting a drag into the sea, for they were fishers,
Mark 1:14 And after the delivering up of John, Jesus came to Galilee, proclaiming the good news of the reign of God,
Mark 1:15 and saying--`Fulfilled hath been the time, and the reign of God hath come nigh, reform ye, and believe in the good news.'
Mark 1:16 And, walking by the sea of Galilee, he saw Simon, and Andrew his brother, casting a drag into the sea, for they were fishers,
Mark 1:17 and Jesus said to them, `Come ye after me, and I shall make you to become fishers of men;'
Mark 1:18 and immediately, having left their nets, they followed him.
The verse centers on "walking", "galilee", "simon", "andrew", "brother", "casting", "drag", and "fishers". It is saying that the verse draws attention to "walking" and "galilee", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 15's "and saying-- Fulfilled hath been the time..." into verse 17's "and Jesus said to them Come ye...", so "walking" and "galilee" belong inside that flow. In Mark context, the local focus is Christ, faith, and discipleship.
A plain takeaway is to answer the verse's own emphasis on "walking" and "galilee" with trust shaped by these words, not by a vague optimism outside the passage.