But since that second force consists essentially in an alternation of these two moments and is itself force, it is likewise, in point of fact, universal medium only then when it is incited or solicited to being so;
baina hura zerizanez bi une horien txandaketa eta hura bera indarra izanez, hori eskatzen zaion heinean baino ez da egiatan elkargune orokorra egitatean;