I think they mean when they say that it means you do not know what is in storefor you.Mabey you will get that job you wanted.Or mabey your bff is moving away.But when your on a journey try to make it...
When God created living creatures only in human did He breathe the "breath of life" and thus create a living soul, therefore "breath of life" differentiates the human from all other living things.
It means that even if bad things are happening that you are still willing to go on with your life. So you basically are teaming up with your life! -that's what my parents always told me...