Ratio magistri clara est, et discipuli consilium eius sequuntur.

Because magistri is in the genitive singular, which often shows possession or close association.

• magister = teacher
• magistri = of the teacher or the teacher’s

So ratio magistri means something like the teacher’s plan/reasoning/method.

Not necessarily. Latin ratio has a wider range of meanings than English ratio.

Depending on context, ratio can mean things like:

• reason
• method
• plan
• system
• way of thinking
• account/explanation

In this sentence, it is probably something like the teacher’s plan, method, or reasoning, not a numerical ratio.

Because clara is an adjective agreeing with ratio, and ratio is a feminine noun.

In Latin, adjectives must agree with the nouns they describe in:

• gender
• number
• case

Here:

• ratio = feminine singular nominative
• clara = feminine singular nominative

So clara means clear and matches ratio grammatically.

Because the subject of the first clause is ratio, which is singular.

The first clause is:

• Ratio magistri clara est = The teacher’s plan/method is clear

Since ratio is one thing, the verb is singular:

• est = is

We know from both case and verb agreement.

• discipuli can be nominative plural = the students
• sequuntur is third person plural = they follow

These match, so discipuli is the subject.

If discipuli were not the subject, we would expect a different form or clearer context.

Consilium is in the accusative singular, which is the normal case for the direct object.

The second clause is:

• discipuli consilium eius sequuntur = the students follow his plan/advice

Here:

• discipuli = subject
• sequuntur = verb
• consilium = direct object, the thing being followed

So consilium is accusative because it receives the action of the verb.

Eius means his, her, or its.

It is the genitive singular form of the pronoun is, ea, id, and it expresses possession:

• consilium eius = his plan, her plan, or its plan

It does not behave like a regular adjective that changes to match the noun in gender, number, and case. Instead, it stays in the genitive because it means of him / of her / of it.

So literally:

• consilium eius = the plan of him/her

In context, eius most likely refers back to magistri: the teacher’s plan.

Because sequuntur is a deponent verb form.

The verb is sequor, sequi, secutus sum, meaning to follow. Deponent verbs:

• have passive-looking forms
• but active meanings

So:

• sequuntur looks like a passive form
• but it means they follow, not they are followed

This is a very common feature in Latin and something learners have to get used to.

Latin word order is much more flexible than English word order because Latin uses case endings to show grammatical function.

English depends heavily on position:

• The students follow the plan

Latin can move words around more freely because the endings already show who is doing what.

So:

• Ratio magistri clara est
• discipuli consilium eius sequuntur

can place words in an order that sounds natural or stylistically effective in Latin, even if it feels different from English.

Classical Latin has no articles like English the or a/an.

So a noun like magister can mean:

• teacher
• a teacher
• the teacher

The exact meaning depends on context.

That is why:

• Ratio magistri clara est could be understood as The teacher’s plan is clear
• discipuli consilium eius sequuntur could be the students follow his plan

English has to supply articles, but Latin usually does not.

Yes, grammatically it could. Eius simply means his/her/its, so by itself it does not specify the exact person.

However, in this sentence, the most natural reference is to magistri, because that is the most obvious singular person already mentioned.

So learners should remember:

• grammatically possible does not always mean equally likely
• context usually tells you who eius refers to

Here, the most natural reading is the students follow the teacher’s plan/advice.

Here is a simple breakdown:

First clause

• Ratio — nominative singular, subject
• magistri — genitive singular, of the teacher
• clara — nominative singular feminine adjective, describing ratio
• est — is

Second clause

• et — and
• discipuli — nominative plural, subject
• consilium — accusative singular, direct object
• eius — genitive singular, his/her/its
• sequuntur — they follow; deponent verb

So the sentence structure is:

• [subject + genitive + adjective + verb], and [subject + object + possessive genitive + verb]