Ashem Vohu is one of two very important prayers in Zoroastrianism. The Ashem Vohu, after the Ahunavar is considered one of the basic, yet meaningful and powerful mantras in the religion. It is also at the end of most of the prayers in the Khordeh Avesta, except a certain few, most notably the Fravarane.
Translation:
There are many translations and all attempts done by scholars do not give an authentic translation of the original with all its possible more deeper significance(s), because they all differ significantly. For example:
Boyce, Mary (2001). Zoroastrians:Their Religious Beliefs and Practices. Routledge.
The main point to be noted in the translation is that the word HOLINESS, can also be replaced with Righteousness.