Passage
then those, indeed, who did gladly receive his word were baptized, and there were added on that day, as it were, three thousand souls,
then those, indeed, who did gladly receive his word were baptized, and there were added on that day, as it were, three thousand souls,
Acts 2:39 for to you is the promise, and to your children, and to all those afar off, as many as the Lord our God shall call.'
Acts 2:40 Also with many more other words he was testifying and exhorting, saying, `Be saved from this perverse generation;'
Acts 2:41 then those, indeed, who did gladly receive his word were baptized, and there were added on that day, as it were, three thousand souls,
Acts 2:42 and they were continuing stedfastly in the teaching of the apostles, and the fellowship, and the breaking of the bread, and the prayers.
Acts 2:43 And fear came on every soul, many wonders also and signs were being done through the apostles,
The verse centers on "indeed", "gladly", "receive", "word", "baptized", "added", "three", and "thousand". It is saying that the verse draws attention to "indeed" and "gladly", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 40's "Also with many more other words he..." into verse 42's "and they were continuing stedfastly in the...", so "indeed" and "gladly" 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 "indeed" and "gladly" with trust shaped by these words, not by a vague optimism outside the passage.