Not safe to say at all, no. It is such an obvious thing to say, and such an easy observation, many people have said something of this nature for a very long time independent of each other. The is basically another phrasing of the question: “how many grains of sand makes a pile?”

I’m not impressed by a cheap observation like this, even when phrased in a clever sounding way. I am impressed when people make new observations when this applies, such as when they are able to model a specific macro system that behaves very differently when the number of inputs is increased by a lot, and show how that is useful for our understanding of nature (including human nature).

And, further, Engels is just paraphrasing Hegel.

This is a quote by Thomas A. Callaghan Jr, but is often mis-atrributed to Stalin.

https://klangable.com/blog/quantity-has-a-quality-all-its-ow...