Philippians 3:20-21

20 But we are citizens of the state (commonwealth, homeland) which is in heaven, and from it also we earnestly and patiently await [the coming of] the Lord Jesus Christ (the Messiah) [as] Savior,

Through the power of the Holy Spirit we know beyond any shadow of a doubt that we are citizens of Heaven right now. We know that we do not have to wait for the benefits of our citizenship. 

We know [positively] that we are of God, and the whole world [around us] is under the power of the evil one. And we [have seen and] know [positively] that the Son of God has [actually] come to this world and has given us understanding and insight [progressively] to perceive (recognize) and come to know better and more clearly Him Who is true; and we are in Him Who is true--in His Son Jesus Christ (the Messiah). This [Man] is the true God and Life eternal. 1 John 5:19-20

Now because we are and forevermore citizens of Heaven, we can have perfect peace with what our citizenship brings us.

Now to Him Who is able to keep you without stumbling or slipping or falling, and to present [you] unblemished (blameless and faultless) before the presence of His glory in triumphant joy and exultation [with unspeakable, ecstatic delight]-- To the one only God, our Savior through Jesus Christ our Lord, be glory (splendor), majesty, might and dominion, and power and authority, before all time and now and forever (unto all the ages of eternity). Amen (so be it). Jude 24-25 

21 Who will transform and fashion anew the body of our humiliation to conform to and be like the body of His glory and majesty, by exerting that power which enables Him even to subject everything to Himself.

Our bodies may be weak and dying now, but that in no way means that we are blemished and faulted. Jesus will return and when He does this mortal flesh will be changed, but currently our spirits and souls are enjoying all of the power that Heaven has to offer.

Yet the Lord is faithful, and He will strengthen [you] and set you on a firm foundation and guard you from the evil [one]. And we have confidence in the Lord concerning you, that you are doing and will continue to do the things which we suggest and with which we charge you. 2 Thessalonians 3:3-4

In conclusion, be strong in the Lord [be empowered through your union with Him]; draw your strength from Him [that strength which His boundless might provides]. Ephesians 6:10