Which is it?

I am telling it badly
You don't want to hear it badly.
I am not good enough to tell it
It might be true, but not from me
You are not able to hear it
You hear, but you don't care
It doesn't matter

"Jehovah is my shepherd" Psalm 23 Jehovah sent his son to tell us we should be careful not to stray from Jehovah THE SHEPHERD as Jehovah is called.

What is a shepherd's job?

Isn't it the shepherd's job to keep the sheep together and to be keeping them safe?

So Jesus saying "take care you do not stray" is him saying "Sure my Father's a Shepherd, but not a very good one.  Now it's YOUR job to stay, not stray."

Trust in Jehovah with all your heart and do not lean on understanding.  But it will take loads of understanding to keep yourself in the flock and whenever you see danger coming you MUST lean on the understanding that danger is near in the form of someone or something taking you away.....to mislead you.....because Jesus said so.

How?

Jesus went on talking and saying "see that you are not terrified"  THAT he REALLY said.