that's just a ridiculous thing to inscribe on a spear.
But not as stupid as 'memory never fades', which is clearly false. Memories fade all the time - it's practically the only thing memories do.
Those dudes are 67% liars and Mat is right not to trust them.
But then it fully goes:
(Your limited) thought is the arrow of time. (Our developed thought is the time loop and back and forth thingy of time).
But that's only on the full size Ashandarei, not the miniature they gave Mat.
Also, the link is intersing IMO