If you think you don't need the
Isaiah 40:31 empowerment .... you're robbing yourself. And
if you are not routinely and confidently performing healing and raising from the dead etc, (just as Jesus and the Apostles did) then you have not yet received the empowerment promised to whosoever waits on the Lord.
If this is what you believe Isaiah was saying in vs 31 then how many have you raised from the dead? How many have you gone to in the hospitals and have healed? Should it not be all by what you believe Isaiah 40:31 says?
This is not what Isaiah was saying. Here is the full context.
Isaiah 40:27 Why sayest thou, O Jacob, and speakest, O Israel, My way is hid from the LORD, and my judgment is passed over from my God? 28 Hast thou not known? hast thou not heard, that the everlasting God, the LORD, the Creator of the ends of the earth, fainteth not, neither is weary? there is no searching of his understanding. 29 He giveth power to the faint; and to them that have no might he increaseth strength. 30 Even the youths shall faint and be weary, and the young men shall utterly fall: 31 But they that wait upon the LORD shall renew their strength; they shall mount up with wings as eagles; they shall run, and not be weary; and they shall walk, and not faint.
The empowerment of the Holy Spirit is given to us at the same time of our Spiritual rebirth like the day of Pentecost, but is not taught in many church's today so many do not even understand what the Holy Spirit is all about.
John 3:5 Jesus answered, Verily, verily, I say unto thee, Except a man be born of water and of the Spirit, he cannot enter into the kingdom of God.
Acts 2:36 Therefore let all the house of Israel know assuredly, that God hath made that same Jesus, whom ye have crucified, both Lord and Christ.
37 Now when they heard this, they were pricked in their heart, and said unto Peter and to the rest of the apostles, Men and brethren, what shall we do? 38 Then Peter said unto them, Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost. 39 For the promise is unto you, and to your children, and to all that are afar off, even as many as the Lord our God shall call. 40 And with many other words did he testify and exhort, saying, Save yourselves from this untoward generation. 41 Then they that gladly received his word were baptized: and the same day there were added unto them about three thousand souls.
Around three thousand souls received the indwelling empowerment of the Holy Spirit on the day of Pentecost as they were all indwelled after Jesus was taken up and the Holy Spirit sent down. They understood what it meant as Peter taught them.