This Parasha contains the tasks that the Kohanim had to perform in the Mishkan. For example, the Ner tamid, the Korbanot, and the clothes of the Kohanim. There are very special clothes for the Kohen gadol, and there are exactly eight of them. Two of these eight garments are the Choshen (The Shield with Stones) and the Efod (The Blue Apron). The Torah formulates a commandment for these two articles of clothing, which states that the Choschen must not deviate from the Efod. This means that the bond between them must not loosen. There is a very deep and instructive message behind this rule:
Chazal see in the Choshen the breastplate of right. With this shield, the Kohen gadol could receive messages from Hashem, for example to resolve legal disputes, i.e. to eliminate interpersonal conflicts. The Ephod, on the other hand, is said to have been symbolic of the relationship between humans and Hashem.
Now you understand the message of the commandment mentioned above. That
Choshen and Efod must always stay together depends on that
together that also connects people to people and
the connection from human to Hashem should always be there and
one must not be placed above the other, as the other. Our obligations to God and our obligations to our fellow human beings are just as important. We should therefore always make an effort in both areas to fulfill them, no matter to whom.