You are braver than you believe, stronger than you seem, and smarter than you think.
This quote helps motivate me because it helps me realize that I'm actually good at things. I also use this quote to help me get through things when I'm nervous because it makes me think that I can do anything, despite the challenge. This quote has also shown me that I should believe in myself because nothing can stand in my way when I really try my best.
Breathing in the first sentence is a participle acting as an adjective.
The second sentence is an auxiliary verb. is and breathing make up the verb.
Breathing is ... go no further. Breathing is the subject of the third sentence. It can only be a noun or a pronoun when it is a subject. So here it is a gerund.