A sailor went to sea to see

A negative thinker see a difficulty in every opportunity,
A positive thinker see an opportunity in every difficulty,
wish u an optimistic life..
If you understand, say “understand”.
If you don’t understand,
say “don’t understand”.
But if you understand and say “don’t understand”.
How do I understand that you understand?
Understand!
I wish to wish the wish you wish to wish,
but if you wish the wish the witch wishes,
I won’t wish the wish you wish to wish.
A sailor went to sea to see,
what he could see.
And all he could see was sea, sea, sea.