Jamieson, Fausset and Brown on Romans 5:2

2. By whom also we have--"have had"

access by faith into this grace--favor with God.

wherein we stand--that is "To that same faith which first gave us 'peace with God' we owe our introduction into that permanent standing in the favor of God which the justified enjoy." As it is difficult to distinguish this from the peace first mentioned, we regard it as merely an additional phase of the same [Meyer, Philippi, Mehring], rather than something new [Beza, Tholuck, Hodge].

and rejoice--"glory," "boast," "triumph"--"rejoice" is not strong enough.

in hope of the glory of God--On "hope," see on Ro 5:4.