Some decisions in life don't seem to matter. Many believe it doesn't matter which religion you choose.  Bible only acknowledges 2 ways to live (13). Most religion says " do" Jesus says "done". If you don't decide to follow Jesus you automatically decide not to. 

Vs 15-21 warn us about false prophets and they are hard to spot. They can be spotted by their fruit. Don't judge by their words or even their miracles (21-23). Give it time. Are they preaching the narrow way? 

Jesus ends the sermon with a challenge.  Where will my faith take me when the floods come? Will I hear and do?