The fish and bird both learn how to swim and fly, respectively. If we exchange their skills, both will die but still, we'll get what we want- the meat.

If you don't know where to go, there is no destination for you.

You're thinking, "I am not good enough to qualify for this entrance examination. I'm wasting my time. I should quit and do something else."

If you know that, you can reach that destination, but if you don't know, you'll keep on standing on the platform of life forever.

It's okay if you don't know what to do in life. Most people don't yet pretend to know. You're honest; hence you can learn.