The three answers to this flat are found in the same eight-letter word. The ALL cueword is the entire eight-letter word. The FIRST cueword is the middle four letters of the word. And the LAST cueword is the first two and last two letters of the word. 

Like Diogenes walking, who once ALL

   this Earth

For some true, honest soul who had deep

   hidden worth,

I have combed every shoe store for good

   honest shoes

To make me forget my walkin' blues. 

His quest for a soul: to not find one,

   he's cursed.

My quest is for a sole and heel and firm

   FIRST.

While he planted a LAST that has grown

   throughout history,

I'd be happy to solve my pedestrian

   mystery.

Answers:

 

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Credit:

The Enigma

March, 2023

COUSIN JOE