(Isaiah 55:1 ESV) "Come, everyone who thirsts, come to the waters; and he who has no money, come, buy and eat! Come, buy wine and milk without money and without price.
(Isaiah 55:2 ESV) Why do you spend your money for that which is not bread, and your labor for that which does not satisfy? Listen diligently to me, and eat what is good, and delight yourselves in rich food.
(Isaiah 55:3 ESV) Incline your ear, and come to me; hear, that your soul may live; and I will make with you an everlasting covenant, my steadfast, sure love for David.
(1 Corinthians 2:14 ESV) The natural person does not accept the things of the Spirit of God, for they are folly to him, and he is not able to understand them because they are spiritually discerned.
According to Is.55:1-3 that which I need to quench my soul cannot be purchased by my own resources and cannot be earned. I must hear and obey the Word of God. The natural man (LOST) cannot hear or receive the things of God.
I must make sure that I am saved. Paul says that we must examine ourselves. I cannot walk as a Spirit-filled man if all I possess is a false religion and empty profession. There are 5 evidences of salvation that I can apply to my life to ensure that I am saved.
#1. Biblical Testimony-I have a time and experience of asking Christ in my life. Rom.10:9-10, 13
#2. Internal Evidence of the Spirit-The Holy bears witness with our spirit that we are saved. Rom.8:15-16
#3. External Evidence of Fruit-All believers must manifest the fruit of the Holy Spirit, which is the character of God. All unbelievers can never manifest the fruit of the Holy Spirit. Gal.5:22-23
#4. Fraternal Evidence-All true believers will love the brothers. If not, they are liars. 1 Jn.2:9-11; 4:20-21
#5. Paternal Evidence-All true believers will be spanked by the Father if in sin. Heb.12:5-11
These 5 evidences or witnesses to salvation are explained in detail in my book "THE FIVE WITNESSES OF SALVATION"
If I have these 5 evidences by faith, then by that same faith I can walk daily as a Spirit-filled man.