And these signs will follow those who believe: In My name they will cast out demons; they will speak with new tongues; they will take up serpents; and if they drink anything deadly, it will by no means hurt them; they will lay hands on the sick, and they will recover.
Before going to sit on his throne, at the right hand of the Father, Jesus left instructions and promises to His disciples. In Mark 16:17-18, the Lord gives wonderful promises for those who believe: In My name they will cast out demons; they will speak with new tongues; they will take up serpents; and if they drink anything deadly, it will by no means hurt them; they will lay hands on the sick, and they will recover. Believing in the name of Jesus has the power to do all those things because whoever does and gives us the ability and who work is the same Jesus Christ our Lord.
Jesus performed many miracles during His ministry on earth. He healed many sick, restored sight to the blind, released demonized, multiplied food, turned water into wine and raised the dead. The manifestation of the power of God through miracles, signs and wonders performed by the Lord Jesus Christ, were not contemplated that once He had finally departed from this world to return to heaven. The desire of His heart was that those who believed in Him made similar and even greater things.
Being Jesus with His Father on earth would continue existing needs. The patients would need to be healed, devils would continue oppressing and enslaving people, and every human being would need salvation. Many believe by miracles, wonders and signs, so the Lord gave His disciples and to those who believe after them power and authority to make them. In John 14:12 Jesus said: Most assuredly, I say to you, he who believes in Me, the works that I do he will do also; and greater works than these he will do, because I go to My Father.
It is quite clear both in Mark 16:17-18 and John 14:12 that believers in Jesus Christ have been invested with power and authority to do such works that He did and even greater things than these. Of course it is not that we have we turned into superheroes Superman or Spider-Man style. That supernatural power comes not from us but from the name which is above every name, the name of Jesus. Therefore, the power to perform miracles comes from who sent us.
Why many Christians are unable to demonstrate the power of God on their journey through life? The Lord gives the answer to this question in Matthew 17:20: So Jesus said to them, “Because of your unbelief: for assuredly, I say to you, if you have faith as a mustard seed, you will say to this mountain, ‘Move from here to there,’ and it will move; and nothing will be impossible for you. We have said that we believe in Jesus, but our faith has not been large enough to realize that He has given us the power to do great works in His name.
Jesus went to the Father, but He has not left us alone. In Acts 1:8, he says: But you shall receive power when the Holy Spirit has come upon you; and you shall be witnesses to Me[a] in Jerusalem, and in all Judea and Samaria, and to the end of the earth. Brother or sister, you already have the power of the Holy Spirit which has been given to testify about Jesus Christ in the nations. Believe and have faith as a mustard seed and signs of those who believe will follow wherever you go. Be brave and show that you have believed in Jesus Christ. God bless you.