What is a danger of being controlled by our emotions?

Toby Logsdon explains in this video that if we just follow our emotions instead of being rooted in God's Word, we will be easily swayed by how we feel, the newest fad, or by the world. 

To combat this, we must let God's Word dictate what we believe and how we live our lives. God's Word is true and unchanging and will allow us to weather the ups and downs of our emotions or opinions. The newest fad or belief system will fade; but God's Word will endure. 

Proverbs 4:23 (NKJV) - "Keep your heart with all diligence,
For out of it spring the issues of life."