# pure and unspoiled before our God and Father

These are traditional ways for Jews to say that something is acceptable to God. Alternate translation: "completely acceptable to our God and Father" 

# the fatherless

"the orphans"

# in their affliction

The fatherless and widows are suffering because their fathers or husbands have died.

# to keep oneself unstained by the world

"to not allow the evil in the world to cause oneself to sin"