I got the Greek Reader app for my iPhone and used it today to analyze some of the words in this passage. This analysis then raised questions and prompted suggestions:
apostles (apostolos apostle, messenger, delegate) Who are we listening to? Who does the sending; i.e., how do we decide to recognize the authority of the one we're listening to, or learning from?
sign (semeion sign, token) What do we see? What do we find convincing?
wonders (teras) What is happening that is so different from ordinary life that we notice it?
devoted (proskartereo persevered, adhered to, gave constant attention to) Imagine a buzzer going off at intervals.You're supposed to write down what you are doing or thinking at that moment. Try it, and see how closely you come to the description of this early Christian congregation.