Passage
Immediately he called them, and they left their father, Zebedee, in the boat with the hired servants, and went after him.
Immediately he called them, and they left their father, Zebedee, in the boat with the hired servants, and went after him.
Mark 1:18 Immediately they left their nets, and followed him.
Mark 1:19 Going on a little further from there, he saw James the son of Zebedee, and John, his brother, who were also in the boat mending the nets.
Mark 1:20 Immediately he called them, and they left their father, Zebedee, in the boat with the hired servants, and went after him.
Mark 1:21 They went into Capernaum, and immediately on the Sabbath day he entered into the synagogue and taught.
Mark 1:22 They were astonished at his teaching, for he taught them as having authority, and not as the scribes.
The verse centers on "called", "immediately", "left", "father", "zebedee", "boat", "hired", and "servants". It is saying that the verse draws attention to "called" and "immediately", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 19's "Going on a little further from there..." into verse 21's "They went into Capernaum and immediately on...", so "called" and "immediately" 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 "called" and "immediately" with trust shaped by these words, not by a vague optimism outside the passage.