Who was the first false teacher?  How do we know who they are? What do they look like and what are their fruits. What does the bible say about false teachers/prophets? What did Jesus say about false teachers/prophets? How do we prevent ourselves from being deceived? 

Hopefully these questions will be answered and allow you to know why focusing on Jesus will allow your faith to be rock solid, guarded and on a sure foundation. 

Scripture Reference:

I Cor 11:1
Matt 7:15-23
Mark 7:7-13
Matt 23 (3)
John 7:17-18
2 Tim 2:15, 4:3-4
Heb 4:12
Luke  11:9-13
2 John 1:7-11
2 Cor 11:12-15