To have external life, we must accept Jesus Christ into our lives. When we receive the spirit of God, our eternal life is certain. Our new life should bear the fruits of the spirit which are faith, love, dominion, mercy, joy, peace, grace, boldness, perfection etc.
All of these are ours through Jesus Christ in us and by the power of the Holy spirit. How many of these fruits can see boldly say we bear in our everyday lives.
Fruit bearing Christians are productive Christians. A proof that you have the holy spirit is your ability to bear fruits and God expects us to bear fruit. You know a mango tree by the mango fruits on it, same way with the church. The world will see Jesus in us when we bear fruits. By their fruits you shall know them.
the proof that a branch is viable is in its ability to bear fruits. So you are viable in the body of Christ when you are bearing fruits.
Galatians 5:22-25
[22]But the fruit of the Spirit is love, joy, peace, longsuffering, gentleness, goodness, faith,
[23]Meekness, temperance: against such there is no law.
[24]And they that are Christ's have crucified the flesh with the affections and lusts.
[25]If we live in the Spirit, let us also walk in the Spirit.
[26]Let us not be desirous of vain glory, provoking one another, envying one another.