When I look back to the life I have lived, I realise that each day in the past has always been intended to be a preparation for today and the present. In God’s overall plan each of us is being prepared for the opportunities that come our way. There is no such thing as a wasted day (unless we allow it).
On the other hand many of the troubles people have today started as just having a little fun. Wrong thoughts and ideas lead to troubles. This is why it is imperative that we cultivate the habit of inculcating good ideas and do what is right all the time.