Passage
Those then who had accepted his word were baptised; and there were added in that day about three thousand souls.
Those then who had accepted his word were baptised; and there were added in that day about three thousand souls.
Acts 2:39 For to you is the promise and to your children, and to all who [are] afar off, as many as [the] Lord our God may call.
Acts 2:40 And with many other words he testified and exhorted them, saying, Be saved from this perverse generation.
Acts 2:41 Those then who had accepted his word were baptised; and there were added in that day about three thousand souls.
Acts 2:42 And they persevered in the teaching and fellowship of the apostles, in breaking of bread and prayers.
Acts 2:43 And fear was upon every soul, and many wonders and signs took place through the apostles' means.
The verse centers on "accepted", "word", "baptised", "added", "three", "thousand", and "souls". It is saying that the verse draws attention to "accepted" and "word", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 40's "And with many other words he testified..." into verse 42's "And they persevered in the teaching and...", so "accepted" and "word" belong inside that flow. In Acts context, the local focus is Christ, faith, and discipleship.
A plain takeaway is to answer the verse's own emphasis on "accepted" and "word" with trust shaped by these words, not by a vague optimism outside the passage.