Etiam si dissensio inter discipulos oritur, bonos mores servare debent.

Si by itself means if.
Etiam si means even if.

So etiam si dissensio inter discipulos oritur introduces a concessive idea: the main statement remains true even in that situation.

• si = if
• etiam si = even if

In other words, the sentence is not just setting up a condition; it is emphasizing that the duty still applies despite that condition.

Dissensio is the subject of oritur, and here it refers to disagreement as a general phenomenon, not necessarily to one specific argument. Latin often uses a singular abstract noun where English might also use a singular abstract noun, such as disagreement, conflict, or discord.

Grammatically:

• dissensio = nominative singular
• it is the subject of oritur

So the sentence is talking about disagreement arising among the students, not counting separate disagreements one by one.

The preposition inter takes the accusative case. That is why discipulos is accusative plural.

• inter = among / between
• discipulos = accusative plural of discipulus

So:

• inter discipuli would be wrong
• inter discipulos is correct

This is something you simply have to learn with the preposition: inter + accusative.

Oritur comes from orior, oriri, ortus sum, which is a deponent verb.

A deponent verb:

• has passive forms
• but an active meaning

So oritur looks passive in form, but it means something active such as:

• arises
• comes up
• springs up

In this sentence, dissensio ... oritur means disagreement arises.

That is why you should not translate it as a true passive like is arisen.

Because it depends on debent.

Debent means they ought, they must, or they should, and verbs like debeo are commonly followed by an infinitive to express what someone ought to do.

So:

• debent = they ought / they must
• servare = to preserve / to keep / to maintain

Together:

• servare debent = they ought to maintain / they should keep

This is very similar to English structure:

• they ought to behave well
• they ought to maintain good conduct

Because bonos mores is the direct object of servare.

• servare = to keep / preserve / maintain
• what do they keep? bonos mores

So both words are accusative because:

• mores is a masculine plural noun
• bonos is the adjective agreeing with it

Grammatically:

• bonos = accusative masculine plural
• mores = accusative masculine plural

The adjective must match the noun in gender, number, and case.

Mores can mean customs, character, morals, or behavior, depending on context. In this sentence, bonos mores servare means something like:

• to maintain good behavior
• to keep good conduct
• to preserve proper manners

A native English speaker may first think only of table manners or polite habits, but Latin mores is often broader than that. It can refer to a person’s moral and social conduct generally.

So bonos mores here is best understood as good conduct or proper behavior, not just nice manners in a narrow sense.

The subject is implied by the verb ending.

Debent is third person plural, so it means they ought or they must. Latin often leaves out subject pronouns when the verb ending already makes the subject clear.

So the sentence does not need an explicit ei or illi for they.

From context, the implied subject is probably the same people being discussed, most naturally the students or people in that situation.

This is very common in Latin:

• debet = he/she/it ought
• debent = they ought

Because discipulos is inside the prepositional phrase inter discipulos and is in the accusative, not the nominative.

That phrase means among the students. It tells you where the disagreement arises, but it does not make discipulos the grammatical subject.

The actual stated subject of the subordinate clause is:

• dissensio = disagreement

The subject of debent is not explicitly stated, but it is understood from the verb ending.

So the sentence has:

• subordinate clause subject: dissensio
• main clause subject: understood they

Yes. Latin word order is much freer than English word order because case endings show the grammatical relationships.

This sentence is arranged in a fairly natural and clear way:

• Etiam si dissensio inter discipulos oritur = subordinate clause first
• bonos mores servare debent = main clause after it

But Latin could reorder parts for emphasis. For example, it could place debent earlier or move bonos mores for stress. The meaning would remain mostly the same because the endings still show the roles.

So the current order is not the only possible one; it is simply a smooth and readable arrangement.

Latin often expresses ideas a little differently from English. Instead of saying exactly behave well, it may say maintain good conduct or preserve proper behavior.

Servare literally means:

• to save
• to preserve
• to keep
• to maintain

With bonos mores, it gives the idea of holding on to proper conduct even when conflict appears.

So this is idiomatic Latin, even if English would more naturally choose a simpler verb like behave.

It has two parts:

1. a subordinate clause introduced by etiam si

   • Etiam si dissensio inter discipulos oritur
   • Even if disagreement arises among the students

2. a main clause

   • bonos mores servare debent
   • they ought to maintain good conduct

So the overall pattern is:

• even if X happens, they should still do Y

That is a very common Latin structure, especially in moral or instructional statements.