I love this quote as it tells you that you need darkness to see stars. So even if something is not going well - you need to remember that something nice is happening around you. If you look for it you will find it - even at your darkest times.
I keep thinking about this... It would be almost impossible to trip on something behind you ... If you were actually walking forward! I want to move forward... Which makes this concept food for thought! Is "stumbling" over the past my own choice? If so... I choose to get up! And not look back!