random line function

void readFromFile(QLabel &output)
{
    QString message;
    int numberOfLines = 10; //file has 10 lines of quotes
    int random = QRand() % numberOfLines; //create random number 1-10
    //open file and create stream
    QFile data("messages.txt");
    if (data.open(QIODevice::ReadOnly))
        QTextStream out(&data);
    //read random line of file
    for (int i = 1; i < random; i++) {

    }
    //read line of file to message and output to QLabel
    message = out.readLine();
    output.setText(message);
}

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I am stuck on a this function I am trying to write  in Qt, which is supposed to read a random line from a text file and output it into a QLabel. Can't figure out how I would select a random line, I'm guessing I would need a loop to the random number, but don't know how to read that specific line? Please help? Am I on the right track here?