oP., often in Hebrews, and commonly in the same sense as here - approach to God through the O.T. sacrifices or the sacrifice of Christ. Paul's word προσαγωγή access expresses the same idea. See Eph 2:18; Eph 3:12. The phrase come boldly expresses a thought which the Epistle emphasizes - that Christianity is the religion of free access to God. Comp. 2Co 3:12, 2Co 3:13.
Unto the throne of grace (τῷ θρόνῳ τῆς χάριτος)
The phrase N.T.o. Throne of glory, Mat 19:28; Mat 25:31 : of majesty, Heb 8:1. In Revelation throne occurs over forty times, either the throne, or his throne, or throne of God. Once throne of the beast, Rev 16:10. Throne of grace expresses grace as the gift of divine power.
Mercy - grace (ἔλεος - χάριν)
Mercy for past sins; grace for future work, trial, and resistance to temptation.
To help in time of need (εἰς εὔκαιρον βοήθειαν)
Lit. for seasonable help, or help in good time; before it is too late; while there is still time to seek God's rest. Others, however, explain, when it is needed; or, before temptation leads to sin.