Before Macbeth found out about his future, he just let fate control his life and wasn't really bothered by it. However, once Macbeth found out that his fate was to become the king, he took the situation directed it to the fate he was told about.
"I think part of the reason why we hold on to something so tight is because we fear something so great won't happen twice." Sad thing is that holding on will also keep a greater thing from coming. Fear should never be a motivation.
Phaedra turned away from Dismina, the woman whom she might have even considered to be a friend. She wanted nothing more than to go with her, to see her beloved Mountain King, but she still had much to do before she could fall into that happiness.
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.