The following sentence contains an adverb clause.
This sentence contains two clauses - an independent clause (We moved) and a dependent/subordinate clause (because our house was too small). Given that the second sentence gives us a reason why they moved, it acts as an adverb, which is why it is an adverbial clause.
The Catholic social teaching principle of human dignity is about understanding that each of us is made in God's image. Every person has an innate human dignity no one can take away. Human dignity is given freely to all human beings; whether saint or sinner, imprisoned or freed, powerful or marginalised.