Arjuna wanted to see Krsna in His universal form, which, although a transcendental form, is just manifested for the cosmic manifestation and is therefore subject to the temporary time of this material nature. As the material nature is manifested and not manifested, similarly this universal form of Krsna is manifested and unmanifested. It is not eternally situated in the spiritual sky like Krsna's other forms. As far as a devotee is concerned, he is not eager to see the universal form, but because Arjuna wanted to see Krsna in this way, Krsna reveals this form. This universal form is not possible to be seen by any ordinary man. Krsna must give one the power to see it.