If i were to elaborate, i would say that although we may not always be able to say "this is justice," each of us knows in our hearts if we have been unjust to someone.
That is a truth with modifications, but I agree with what I see as the general idea; we know justice in our laws because we have some "sense of right and wrong". A common misconception is that we have a sense of right and wrong because we have laws.
For myself, I wouldn't use the word sacred about any of my convictions. It is a very emotionally laden word as I understand it. I might say that the love between two people is a sacred, or just love itself, but that statement is more poetic than informative, as I see it.