So, if we played this game, the first text would appear, then after we click for the next one, the function would be run adding 5 points to our intelligence stat and immediately would show the next text. If we wanted to go back to the first text it wouldn't be possible. This is mainly due to Monogatari not knowing what you are doing exactly in your function, if it were to allow you to go back, we could be getting infinite points just by going back and playing it again because there is no way to know what changed.