The passage groups repose and justice as desirable conditions whose proper avenues are obstructed. Hardship and oppression are undesirable, yet their routes are opened—an inversion conveying the severity of the situation.
Original groupRelevant outcome
Ease, justiceWhat should be open is shut
Hardship, injusticeWhat should be shut is opened
The four concepts are compressed into two larger consequential categories. Repeating one independent clause for every noun would weaken the economy and the force of the collective reversal.