I agree, the quote function makes it 'cleaner'. I didn't use it that much until now because it makes everything harder to read as things get smaller and in many cases, it breaks the reading flow. But this incident here made me a bit more aware that people are actually concerned about plagiarism and that this seems to be important to them.
In the coming days, I'll successively go through my past posts and check them carefully  


No worries, I harbor no ill feelings. As this is my hobby I have absolutely no intentions of having mortal enemies, my free time is much too valuable for that