What are the benefits which, in this life, either accompany or flow from justification, adoption, and sanctification?

Answer

The benefits which, in this life, accompany or flow from justification () are: assurance of God's love, peace of conscience, joy in the Holy Spirit (), increase of grace, and perseverance in it to the end (; ; ).

Read the 5 proof texts (KJV)

Romans 5:1-2,5: ¹Therefore being justified by faith, we have peace with God through our Lord Jesus Christ: ²By whom also we have access by faith into this grace wherein we stand, and rejoice in hope of the glory of God. ⁵And hope maketh not ashamed; because the love of God is shed abroad in our hearts by the Holy Ghost which is given unto us.
Romans 14:17: For the kingdom of God is not meat and drink; but righteousness, and peace, and joy in the Holy Ghost.
Proverbs 4:18: But the path of the just [is] as the shining light, that shineth more and more unto the perfect day.
1 John 5:13: These things have I written unto you that believe on the name of the Son of God; that ye may know that ye have eternal life, and that ye may believe on the name of the Son of God.
1 Peter 1:5: Who are kept by the power of God through faith unto salvation ready to be revealed in the last time.