What does silent pride mean to you?

Being satisfied in ones effort, perhaps in just for the sake of the effort, without any need to publicize, or receive acknowledgement for, the act or associated feelings beyond ones own recognition.

Not much. It is too short to be a useful aphorism and too odd to merit analysis.

Silent pride seems better than boastful pride, to me. If you must be proud, then it seems to me you should keep it to yourself. There’s nothing worse than someone going on about how proud they are of themselves.

But in my opinion, pride is a dangerous feeling. It is best not to feel it at all, neither positively nor negatively. Of course, that’s probably just because I need to do that as a technique to avoid depression.

Not much – pride is pride, whether it is silent or voiced.

Note that pride is not always a bad thing; it can be a positive thing when a person has accomplished something good for himself.

Silent or voiced is really immaterial – pride is a personal thing. You know what you have achieved, whether you tell someone or not.

Silent pride can be seen as arrogance or smugness, if it is handled poorly.

I agree with @elbanditorso. Silent pride could be humility or it could be silent but simmering to where it’s arrogance.