Perfective

When learning Russian, it's important to understand the difference between perfective and imperfective verbs.

Many textbooks on Japanese claim that the language has verbal tenses, namely, the past and the non-past, but many academics proclaim that Japanese has really verbal aspects, not tenses, namely the perfective and imperfective aspects. In this way, Tagalog is more like Japanese, with its complete, progressive, and contemplative as main aspects.

The Slavic influence on Yiddish isn't just vocabulary and suffixes, but also extends to the verb system, where many verbs have perfective and imperfective forms.

That's why there are perfective and imperfective aspects in Russian. Try to familiarize yourself with them!

a perfective alteration

It is not likely that Eternal Life ſhall be a torpid and unactive ſtate, or that it ſhall conſiſt only in an uninterrupted and endleſs Act of Love; the other Faculties ſhall be employed as well as the Will, in Actions ſuitable to, and perfective of their Natures; […]