1 Corinthians 14:1 says, "Eagerly pursue and seek to acquire love; and earnestly desire and cultivate spiritual gifts."
I firmly believe that "signs and wonders" and all the spiritual gifts of 1 Corinthians 12:8-10 are valid for today and should be "earnestly desired" for the edification of the body and the preaching of the gospel. It is perfectly clear that in New Testament, the gospel was authenticated by signs, wonders and miracles of various kinds and descriptions. . . . Was it only meant to be true of the early church? . . . The Scriptures never indicate that these things were only temporary ... never! There is no such statement anywhere.
SIGNS AND WONDERS CONFIRM THE MESSAGE
Mark 16:17 Jesus said; "And these attesting signs will accompany those who believe: In My name they will drive out demons; they will speak in new languages; they will pick up serpents; and even if they drink anything deadly , it will not hurt them; they will lay their hands on the sick, and they will get well" ... Mark 16:20, "And they went out and preached everywhere, while the Lord kept working with them and confirming the message by the attesting signs and miracles that closely accompanied it"!
Signs and wonders confirm the message of the gospel and are not to be sought after as a means in themselves. Romans 1:16 says, "The gospel is the power of God unto salvation."
The gospel is the power of God unto salvation, not signs and wonders. Paul says, "Jews demand signs, Greeks seek wisdom, but we preach Christ crucified . . . the power of God." (1 Corinthians 1:22-23). The "word of the cross is . . . the power of God." (1 Corinthians 1:18) Sign-seeking is a diversion from the power of Christ crucified. Thus Jesus himself said, "An evil and adulterous generation seeks for a sign." (Matthew 12:39; 16:4).
But there is a fatal flaw in bringing these texts against longing for signs and wonders. If desiring signs and wonders dilutes the power of the gospel–then the early Christians and the apostles themselves were wicked and adulterous, because they so passionately wanted signs and wonders with their preaching.
For example, the disciples prayed in Acts 4:30, "Lord, look upon their threats, and grant to Your servants power to speak Your word with all boldness, while You stretch out your hand to heal, and signs and wonders are performed through the name of your holy servant Jesus."