What makes the Liahona work?

Before that, we need to understand how it came to be. People didn't make it. So no matter how good we are or smart we are or whatever, we still need guidance from Heavenly Father. "And the Lord prepared it. And behold, there cannot any man work after the manner of so curious a workmanship." Man couldn't have done it. And God loves us, so He did. 

"And it did work for them according to their faith" (Alma 37:40). It works according to their faith. I need to ask more. I need to ask for guidance more often, and believe God will give it to me. I think it's possible to go too far to the "God wants me to make decision on my own and do things the best that I can do before asking Him" side. He wants to help me, and He wants to grow our relationship. 

Things that break it: slothfulness (apathetic, lazy), not exercising our faith and diligence 

Transgression, traveling an indirect course (Alma 37:41-42)

Or don't give heed. So not only when you do not ask, but when you don't heed what is given to you. 

Look and live! It's there. The way is prepared. Just look. The words of Christ can lead us a straight course to eternal bliss