Q: What are the benefits which in this life do accompany or flow from justification, adoption, and sanctification?
A: The benefits which in this life do accompany or flow from justification, adoption, and sanctification, are, assurance of God's love, peace of conscience, joy in the Holy Ghost, increase of grace, and perseverance therein to the end.

Romans 5:1-2, 5. Therefore being justified by faith, we have peace with God through our Lord Jesus Christ: by whom also we have access by faith into this grace wherein we stand, and rejoice in hope of the glory of God. . . And 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.
Colossians 1:10-11. That ye might walk worthy of the Lord unto all pleasing, being fruitful in every good work, and increasing in the knowledge of God; strengthened with all might, according to his glorious power, unto all patience and longsuffering with joyfulness.
Proverbs 4:18. But the path of the just is as the shining light, that shineth more and more unto the perfect day.
Ephesians 3:16-18. That he would grant you, according to the riches of his glory, to be strengthened with might by his Spirit in the inner man; that Christ may dwell in your hearts by faith; that ye, being rooted and grounded in love, may be able to comprehend with all saints what is the breadth, and length, and depth, and height.
2 Peter 3:18. But grow in grace, and in the knowledge of our Lord and Saviour Jesus Christ. To him be glory both now and for ever. Amen.
Jeremiah 32:40. And I will make an everlasting covenant with them, that I will not turn away from them, to do them good; but I will put my fear in their hearts, that they shall not depart from me.
1 John 2:19, 27. They went out from us, but they were not of us; for if they had been of us,they would no doubt have continued with us: but they went out, that they might be made manifest that they were not all of us. . . But the anointing which ye have received of him abideth in you, and ye need not that any man teach you: but as the same anointing teacheth you of all things, and is truth, and is no lie, and even as it hath taught you, ye shall abide in him.
Revelation 14:12. Here is the patience of the saints: here are they that keep the commandments of God, and the faith of Jesus.
1 Peter 1:5. Who are kept by the power of God through faith unto salvation ready to be revealed in the last time.
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.

Westminster Project - See John Flavel expand on the phrase "Joy in the Holy Ghost."