What is the interpretation of "what no eye has seen nor ear heard," and does that contradict the Prophet's vision of Paradise during the Isra' and Mi'raj?

The aforementioned text is not a verse, but rather part of a Hadith (definition) Qudsi narrated by Al-Bukhari and Muslim. Its wording is: "Allah Almighty said: I have prepared for My righteous servants what no eye has seen, no ear has heard, and no human heart has conceived." In another narration: "Nor does any close angel know of it, nor any sent prophet." This Hadith clarifies the immense eternal bliss that Allah has prepared for the believers in Paradise, which transcends human comprehension, affirming His saying: "No soul knows what has been hidden for them of comfort for eyes as reward for what they used used to do." This bliss differs from everything humans know in this world except in names, and it surpasses the imagination of minds, even the Prophet's - peace be upon him - vision of Paradise does not mean that he was acquainted with all its ever-renewing delights.