Passage
and immediately he called them, and, having left their father Zebedee in the boat with the hired servants, they went away after him.
and immediately he called them, and, having left their father Zebedee in the boat with the hired servants, they went away after him.
Mark 1:18 and immediately, having left their nets, they followed him.
Mark 1:19 And having gone on thence a little, he saw James of Zebedee, and John his brother, and they were in the boat refitting the nets,
Mark 1:20 and immediately he called them, and, having left their father Zebedee in the boat with the hired servants, they went away after him.
Mark 1:21 And they go on to Capernaum, and immediately, on the sabbaths, having gone into the synagogue, he was teaching,
Mark 1:22 and they were astonished at his teaching, for he was teaching them as having authority, and not as the scribes.
The verse centers on "called", "immediately", "having", "left", "father", "zebedee", "boat", and "hired". 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 "And having gone on thence a little..." into verse 21's "And they go on to Capernaum and...", 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.