Finally I understand a wee bit more of what metaphysics means in practice and what to avoid

We begin - and this enumeration will allow us to summarize - with

1. Seeing things in their immobility, in their identity.

2. Separating things from one another, detaching them from their mutual relationships.

3. Establishing eternal divisions between things, impassable walls.

4. Opposing opposites, affirming that two opposites cannot exist at the same time.

Also, mechanical and dialectical change distinguished

We see then that dialectical motion contains within itself processes or autodynamism, which is its essential feature. For not every motion or change is dialectical. If we approach the study of a flea from the dialectical viewpoint, we shall say that it has not always been what it is and that it will not always be what it is. If we crush it, this certainly represents a change for it, but will this change be dialectical? No. Without us, it would not have been crushed. Hence, this change is not dialectical, but mechanical.

Therefore, we must be careful when we speak of dialectical change. We think that if the earth continues to exist, capitalist society will be replaced by a socialist and then a Communist society. This will be a dialectical change. But, if the earth explodes, capitalist society will disappear not through an autodynamic change, but through a mechanical change.