Explanation :
"It is when we hit the teen end, does the world follow the third law." :
The third law here is the third law of motion by Newton. It says,"Every action has an equal and opposite reaction". When we hit the teen years, our rebellious actions start giving a reaction with an equal force. We are pushed to start taking responsibilities and think about our future in depth.
"We get trapped in the beauty of fear, fear of falling behind." : As we start entering the real world, we start developing a fear. What if nothing works out? What if you fail to get a good job and live a stable life? Even the idea of it is scary. What if you fall behind everyone else in the race called Life?
"We need a guarantee. A certificate will do that." : Because we are so scared, we look for a guarantee that will ensure us a secure future. Thus, we work hard to get a University Education and score well in our exams so that we can get that certificate that can get us a good job.
"Lately, life fits into earning and burning of hard money." : In recent times, the meaning of life fits into earning and spending money. We now live a robotic life. Like machines, with no passion.
"What does the future hold? The great worry." : We constantly worry about what our future holds. To such extent that we forget to live our present.
"It's all about numbers, and they say 'us' can not be quantified. " :
Our life is all about numbers. When you are a student, its the marks that you score in your exams and when you are an adult, its the amount of money you earn from your work. Other times, its about your Blood Pressure or your cholesterol levels. Our life's are governed by numbers, even though most people say that you can not quantify the various aspects of us humans, like our emotions.
"Here life options serve as counting thin lines." : Imagine a series of very thin lines, now imagine counting them. It's not easy. Just like the  numerous life options that you are given as a young adult to choose from.
"Wait for a novel to delta your philosophy or is your will a build of simplicity." : We are all stuck in this illusion created by us. Some of us escape it, after being struck by realizations that come as a result of reading some adventure novels. We read and watch people who live their lives to the fullest, and we envy them. We want to be them. "Someday..", we tell ourselves.
Do you want to wait for a novel or story of some one else to change the way you live your life right now? Or do you have the will to take the step forward on your own?
"Chaos holds fear yet a win, but Simplicity my friend is the truth searched by the one hiding within." : The system built by us is chaotic. We work tirelessly and compete with everyone else, to gain a superiority and achieve some success. Its chaotic, its appealing and it works. To some extent. But still we are not happy people.
Why? That is because, it is simplicity that we are looking for from inside.

The next few lines serve as a guild to help you hack your life, to find simplicity and peace. To have the courage to make decisions that don't look profitable at first, but always end in absolute satisfaction when you are on your death bed reflecting on your whole life.

Thank you for reading.
-KD.