An example of why Ruby is simply the best

gistfile1.m

var conversationAsString = "";
  
for(var i=0; i < [aMessages count]; i++) {
    m = aMessages[i];
    var messageTime = [CPDate dateWithTimeIntervalSinceNow:0];
    var messageBody = [[m firstChildWithName:@"body"] text];
    
    var messageAsString = "[" + messageTime + "] " + [m from] + ": " + messageBody;
    
    conversationAsString += messageAsString + "\n";
}

CPLog.info(conversationAsString);

gistfile2.rb

puts messages.map { |m| "[#{Time.now}] #{m.from}: #{m.body.value}" }.join("\n")