Christ in his death has borne the consequences of our sin & thus reconciled us to God. Note that the apostle Paul never speaks of a reconciliation of God to us; it is we who were estranged. Being now justified (& reconciled) by Christ's death, we shall ... be saved in the final Judgment by his life, through our participation in his present life as the risen Lord. Now, under the gospel.
Our confidence in God. To be a Christian in the first century was both difficult & dangerous. Neither death, nor life, whether we live or die we shall not be separated. Angels ... principalities ... powers are supernatural beings, whether evil or good, & or various ranks. Height & depth, the highest point to which the stars rise & the abyss (A deep crack or gap in the earth earth) out of which they were thought to to ascend; no supposed astrological power can separate us from Christ or defeat God's purpose for us.
Reference summary used from The New Oxford Annotated Bible with Apocrypha Expanded Edition,An Ecumenical Study Bible, RSV