When you spend time in an airport, you'll realise that life never stops moving. New people arriving, others departing, it's a never-ending loop. If i've learnt anything from spending hours in airports;
Life goes on. People come and go, nothing seems to be capable of stopping it. Put this into application, you'll see that nothing can hold you back. Moments when you feel like quitting. Moments where you stop making an effort to live, and just let everything collapse.
The only reason you don't just take your life, is because subconsciously, part of you still believes in hope. part of you believes that it can get better. part of you believes life goes on.
Theres always hope, no matter how bad it may be (and i do mean that).