It is ultra critical to fully know and closely understand what Jesus said while He was with us. To know Him and make certain He knows you. During His life and period of teaching, He accomplished innumerable works for His kingdom. His time with us was both historic and of eternal significance. 

“Not everyone who calls out to me, ‘Lord! Lord!’ will enter the Kingdom of Heaven. Only those who actually do the will of my Father in heaven will enter. On judgment day many will say to me, ‘Lord! Lord! We prophesied in your name and cast out demons in your name and performed many miracles in your name.’ But I will reply, ‘I never knew you. Get away from me, you who break God’s laws.’”
– Mt 7:21-23

For this is the will of my Father, that everyone who looks on the Son and believes in him should have eternal life, and I will raise him up on the last day.”
-Jn 6:40

From His parables, lessons, behavior, miracles, holiness, words and examples, we have a clear view of God made flesh. Where His spoken words as written in various books of the Bible really appeal to our closest attention.