Hebrews 12:14

We need to live peaceably with all people as much as we can (cf. Matthew 5:9; Mark 9:50; Romans 12:18; Romans 14:19) because peaceful interpersonal relationships foster godliness (James 3:18). However this writer’s emphasis was more on the objective reality that results from Christ’s death than on our subjective enjoyment of peace. Since we will one day see the Lord, and since no sin can abide in His presence (1 John 3:2), we must pursue holiness in our lives now. A better translation than "sanctification" here is "holiness" (Gr. hagiasmos; cf. hagiatetos in Hebrews 12:10, and hagiasomenoi in Hebrews 10:10). In Koine Greek, nouns ending in mos in the nominative case describe action. As with peace, holiness is our present state, and we need to continue to manifest it by remaining faithful when tempted to depart from the Lord.

This statement may seem at first to contradict the fact that Satan saw God and appeared in His presence in Job 1, 2. While Satan did and probably still does have access to God’s presence, that will not be his permanent privilege. The writer of Hebrews spoke here of the permanent privilege of human beings.