Determination

What people consider possible or impossible is not always correct. But, we must also accept that certain things are impossible. 

For example, no matter how charming or charismatic you are, you cannot convince a door that it's not a door. This is simply impossible. 

However, if somebody tells you that you can't write a story about a given subject or with a particular hook, then tell them "just watch me."

Most problems can be solved. Most questions have answers. It is not always easy to see, especially if it is just sprung on you. 

But don't let fear or panic cause you to run away. All that lays that way is mediocrity at best. Have determination. Of you want it badly enough, make it happen. Don't run away scared.  Don't make excuses. Just keep working at it. You will find an or determine it's actually impossible. But until you can prove its impossible, you simply need more determination.