I was reflecting on these verses that talk about Jesus blood, the power of the Holy Spirit and holiness of heart & life and I also posted few comments from bible commentators for each of these topics.
"But if we walk in the light, as he is in the light, we have fellowship with one another, and the blood of Jesus his Son cleanses us from all sin." IJohn 1:7
But if we walk in the light - If, having received the principle of holiness from him, we live a holy and righteous life, deriving continual light, power, and life from him, then we have fellowship one with another; that is, we have communion with God, and God condescends to hold communion with us. This appears to be the intention of the apostle; and so he was understood by some versions and MSS., which, instead of μετ' αλληλων, with each other, have μετ' αυτον, with him. Those who are deeply experienced in Divine things converse with God, and God with them. What John says is no figure; God and a holy heart are in continual correspondence.
The blood of Jesus Christ - The meritorious efficacy of his passion and death has purged our consciences from dead works, and cleanseth us, καθαριζει ἡμας, continues to cleanse us, i.e., to keep clean what it has made clean, (for it requires the same merit and energy to preserve holiness in the soul of man, as to produce it), or, as several MSS. and some versions read, καθαριει and καθαρισει, will cleanse; speaking of those who are already justified, and are expecting full redemption in his blood.
And being cleansed from all sin is what every believer should look for, what he has a right to expect, and what he must have in this life, in order to be prepared to meet his God. Christ is not a partial Savior, he saves to the uttermost, and he cleanses from All sin.
(Clarke's Commentary on the Bible)
"But you shall receive power when the Holy Spirit has come upon you." Acts 1:8
But ye shall receive power,.... From on high, with which they were to be endured, Luke 24:49 meaning the power of the Holy Ghost, strength from him to preach the Gospel, and work miracles in confirmation of it, and courage and greatness of mind, amidst all reproaches and persecutions, to face and oppose their enemies, profess the name of Christ, abide by his truths and ordinances, make their way through all opposition and difficulties, and spread the Gospel all over the world; for intend of enjoying worldly ease, honour, wealth, and riches, they were looking for, our Lord gives them to understand that they must expect labour, service, afflictions, and trials, which would require power and strength, and which they should have:
after that the Holy Ghost shall come upon you; from above, from heaven, as he did, and sat upon them in the form of cloven tongues, and of fire; upon which they were filled with knowledge and zeal, with strength and courage, and with all gifts and abilities necessary for their work:
and ye shall be witnesses unto me; of the person of Christ, of his deity and sonship, of his incarnation, his ministry, and his miracles, of his suffering and death, of his resurrection from the dead, and his ascension to heaven. This was to be their work, and what belong to them, and not to enquire about a temporal kingdom, and the setting up of that, and the times and seasons of it; their business was to testify of the sufferings of Christ, and the glory that followed, and to preach a crucified Jesus, as the only Saviour of lost sinners.
(Gill's Exposition of the Entire Bible)
"Follow peace with all men, and holiness, without which no man shall see the Lord." Hebrews 12:14
That state of continual sanctification, that life of purity and detachment from the world and all its lusts, without which detachment and sanctity no man shall see the Lord - shall never enjoy his presence in the world of blessedness. To see God, in the Hebrew phrase, is to enjoy him; and without holiness of heart and life this is impossible. No soul can be fit for heaven that has not suitable dispositions for the place.
(Clarke's Commentary on the Bible)