For we walk by faith [we regulate our lives and conduct ourselves by our conviction or belief respecting man’s relationship to God and divine things, with trust and holy fervor; thus we walk] not by sight or appearance.
(2 Corinthians 5:7, Amplified Bible)

In the heart or spirit of  every Christian lies the most powerful force in all ages and existence.  That power is the Word of God and the very presence of Jesus Christ.  When you pray in the Spirit your spirit sees through the eyes of God Almighty and not to the natural world.  When we walk live and pray by sight we are limiting the power of God in our lives.  Praying in the Spirit releases all anchors and barriers of the sense ruled world that hinders our effectiveness and puts your prayer in agreement with God Almighty.  When you pray you have become a yielded vessel for God to pour out His power and desires into this world.  Your faith and spirit will daily grow immensely in the power of God with the operation of the Gifts of the Spirit following.  A person who has a solid prayer life of extended prayer is one who  has laid his life down for the Lord Jesus Christ.  How much are you willing to do to save the life of one soul?  “Greater love has no one than this, than to lay down one’s life for his friends” (John 15:13).

Since we consider and look not to the things that are seen but to the things that are unseen; for the things that are visible are temporal (brief and fleeting), but the things that are invisible are deathless and everlasting. 
(2 Corinthians 4:18-5:1)
NOW FAITH is the assurance (the confirmation, the title deed) of the things [we] hope for, being the proof of things [we] do not see and the conviction of their reality [faith perceiving as real fact what is not revealed to the senses].
(Hebrews 11:1, Amplified Bible)
It is the Spirit who gives life; the flesh profits nothing.  The words that I speak to you are spirit, and they are life.
(John 6:63)