Two different posters just expounded 1Cor.8-13 for you, as to why prophecy, and thus the other spiritual or sign gifts have ceased: because that which is perfect (or complete) is come, and that which is in part (the temporary gifts of the spirit) have been done away.
I disagree here on, that while Christ has come, died and was resurrected his work is not complete until he returns to claim his bride, conquer Satan and usher in the Millennial Kingdom.
But let me give you a challenge. To be clear however, I am speaking of gifts, the gifts of the Spirit as listed in 1Cor.12. I fully realize that God is able to heal today and do other works as he sees fit. So please don't answer that I don't believe that God heals. I do. I see the gift of healing in each individual today through prayer. I do not believe in faith healers of the Benny Hinn, Earnest Angley, Kathryn Kuhlman ilk but rather that the gift has changed for today in that each Christian, through prayer, receives healing, prays for healing for others. If you're looking for proof that someone can bop you in the forehead, you fall on the floor flailing and foaming then you won't find someone. Neither will you find anyone who heals as Christ did or as the disciples did in scripture.
My challenge to you is to show me one instance of someone today who has the gift of healing.
Show me one person today who has the Biblical gift of speaking in tongues (foreign languages). I suggest that ANY missionary who preaches in another language could be considered to have the gift of tongues.
If you can't do this, wouldn't you agree with me that they have ceased? They ceased over 1900 years ago, and there is no proof they are in evidence today.
I do not believe they have ceased only taken a different form that works in today's world.
Here is what you would have to prove for the gift of healing.
There came also a multitude out of the cities round about unto Jerusalem, bringing sick folks, and them which were vexed with unclean spirits: and they were healed every one. (Acts 5:16)
Notice that people who were sick came and others brought their sick, not only from Jerusalem but from all the cities around Jerusalem, and they were healed every one.
All the broken bones, blindness, the lame, the deaf, the dumb, the diseased, the leprosy, the paraplegics, the quadriplegics, all, everyone of them were healed.
That would be equivalent to a "faith healer" of today to going into a large city and going from hospital to hospital, and going up and down the corridors of each hospital and healing all--everyone in the hospitals, including the ER rooms, of each and every sickness. Is there someone you know that has that power--"the gift of healing"? No one has had that gift since the days of the apostles, and likewise the rest of the sign gifts. Can you prove me wrong?