This is a very true quote, meaning that you should never give up, for the greatest thing in your life might be right around the corner. If you give in to temptation, you may never find out what success you could have had.
The best love is the one that makes you a better person. Without changing you into someone other than yourself. Real love doesn't love someone else or who they think they can make you, they love you as you are and try and make you better!