I don't know. I can plausibly read it (knowing nothing about the man) as self-deprecating. A realisation that he's bound by what the law says, even if _he_ finds it unjust.
For example, if a jury finds a defendant guilty of some crime, because they really did it (let's say Aladdin stole some bread from the supermarket and it's clear beyond reasonable doubt that he did indeed), and the law dictates that the _minimum_ penalty is 10 years, then a judge is bound. It does not matter one iota that both the jury and the judge feels this punishment is excessive bordering on ridiculous; in that sense, it is 'a court of law' and not 'a court of justice'. It's not self-serving, it's self-denigrating: Awareness that the judge/jury can't just decide together how to proceed.
That's what jury nullification is about: If a jury member realizes the judge is going to be forced to give a to them utterly ridiculous sentence if the jury finds the defendant guilty, you can simply decide to find them not guilty even though you are well convinced beyond reasonable doubt that they are. Now they are meting out justice and flaunting the law. The jury can actually get away with this (as this news article again shows); a judge absolutely wouldn't be able to.
NB: Current SCOTUS seems to just do whatever the heck they feel like, flaunting all plausible readings of a given law, deference to expertise, and precedence (e.g. how modern SCOTUS opinions often write that Stare Decisis is meaningless – saying that it matters "unless it was wrongly decided" is a euphemism for "it does not matter", of course). So specifically modern day SCOTUS? They seem to think they are beyond the law. It also shows how I really, really don't think you _want_ a court to think itself a court of justice, meeting out excessive punishments because they feel that is just, and letting defendants clearly guilty of egregious acts go free or nearly so for some imagined reason. It also means that any clash with the law has utterly unpredictable consequences. By definition, minimum and maximum penalties clash with the notion that a court is 'a court of justice' instead of 'a court of law'.