Very few things people claim are true are explicitly stated in scripture in a single context.
"Look
Jesus said this mysterious thing at the end of a parable & Paul
briefly mentioned something that sorta sounded like it had something to
do with what Jesus was talking about & bam! Now we have a doctrine
that we can write 100s of books about & that we must hang our lives
upon."
Even the idea of having doctrines is shady.
"Here
is some prepackaged truth that makes you feel like you should get
closer to God but in all practically prevents you from relating to Him
because Jesus is The Truth means the truth is Jesus! You have no use in knowing the Father. Just learn crap & try hard so you can feel better about yourself."
Jesus
didn't hire scribes to write books for Him. Jesus wasn't coming to give
us another religion of how to get to God. Jesus' message was
essentially, "God our Father loves you. Trust me so you can experience
His love from my Spirit." It was "Know God & his love for free!" It
wasn't study & serve & strive to know God.