"In order to find the treasure, you will have to follow the omens. God has prepared a path for everyone to follow, you just have to read the omens that he left for you."(31)
Everyone has a purpose in life. The choices you make can affect your future. If you obey the omens that are given to you and stay on your path God has planned, you will live a purposeful life.
"One afternoon, on a visit to his family, he had summoned up the courage to tell his father that he didn't want to become a priest. That he wanted to travel." (11)
He (Santiago) grew up being told he was gonna be a priest, that's what his parents wanted. As a young person, you only have your parents supporting you and if you are doing something they didn't plan for you, it's less likely for them to support you. For Santiago it must have been hard to tell his parents he was gonna do contrary of what they had planned for him, but he knew he wanted to do this and believed in himself no matter what others said.
"'Because i don't live in my past or my future. I'm interested only in the present. If you can concentrate on the present you'll be a happy man."'
I believe this quote can follow the theme of have the ability to love and let go. If you are always focused on your past, you do not have the ability to let go. In the same sense, if you are just focused on the present, then you can just live and love without worrying about what happened or what will happen.
"'As you wander around carry this spoon with you, without allowing the oil to spill." (34)
When the man says this to Santiago he means more than what he says. In life you can't always focus on the small stereotypes people put upon you (school, good grades, social life) and focus on the other things. For example, don't be afraid to go do something fun and crazy with your friends, but also be able to maintain a healthy life.
"'Because it's the thought of Mecca that keeps me alive... I'm afraid that if my dream is realized I'll have no reason to go on living"(57)
The Merchant has a fear of living his dream because if he does, he'll have nothing else to work for. If people are in constant fear of living their dreams the world would be a boring sad place. Follow your dreams!