To this even non-Muslims attest. The instinctive feeling of the existence of another world after death, is one of the strongest evidences of this existence. If God wants to convince people of something, He implants conviction of it in their hearts. Furthermore, the longing for an eternal life is a common feeling among people that cannot be taken lightly. Great truths like this cannot be accepted by way of proof or material confirmation, but through belief, inspiration and personal feeling.
Inspiration is itself an important factor in the understanding of truth.
It will happen after the first blowing of the Trumpet, which Israafeel will do at the command of his Lord. Then, when the Trumpet is sounded, truly, that day will be a hard day, far from easy for those without Faith. The Trumpet Its reality is one of the unseen matters to be believed in it as Allah the All-Aware wants. What we know is that it is a horn which the angel will use to blow. At the first trumpeting of the Resurrection, the whole world will cease to be in the form which we see now.