In “I had no time to hate, because”, Dickinson says that “enmity” ends after one dies. As she says in the last lines of the first quatrain, life is not so ample to end enmity. If we choose to make enemies, there is no end to it. On top of that, it is easier to make enemies than lifelong friends. So, it is up to the readers whether they want to finish enmity or not.