“Those who are called to be partakers of God’s holiness must be holy themselves; this is the recurring theme of the Pentateuchal law of holiness, echoed again in the New Testament: ‘Ye shall therefore be holy, for I am holy’ (Lev. 11:45, etc.; cf. 1 Pet. 1: 15.). To see the Lord is the highest and most glorious blessing that morals can enjoy, but the beatific vision is reserved for those who are holy in heart and life.” (F. F. Bruce, The Epistle to the Hebrews, NICNT, pp. 364-365).
“To praise His name involves more than the mere repetition of the word qadosh [holy-jwm]. It includes deep meditation upon God and His attributes and the living of a life of humility in accordance with the precepts laid down in His Word. It is, in other words, the life of faith in Jesus Christ, lived for the glory of God.” (Edward J. Young, The Book of Isaiah, Vol. 1, p. 243).
“Sanctification has especial regard to God. Even though the whole world blazes with war, we must not let go of sanctification because it is the chain which binds us in union with God. . . . No one can see God without sanctification since we shall only see God with eyes that have been renewed according to his image.” (John Calvin, Commentary on Hebrews, at 12:14).
Quotes from the Reflection for Trinity Presbyterian Church of the Orthodox Presbyterian Church.