Mater dicit panem non statim secandum esse in partes nimis parvas, quia pater magnum frustum semper petit.

Because after dicit, Latin uses an indirect statement construction: the subject of the reported idea goes into the accusative, and the verb goes into the infinitive.

So the basic pattern is:

• Mater dicit = Mother says
• panem secandum esse = that the bread should be cut

Even though panem is the logical subject of secandum esse, it appears in the accusative because it is the subject of an indirect statement.

If this were a direct statement, you would expect something like:

• Panis secandus est = The bread should/must be cut

But after dicit, that becomes:

• panem secandum esse

It is an indirect statement containing a passive periphrastic.

Two things are happening at once:

1. Indirect statement after dicit

   • Latin often reports speech or thought with accusative + infinitive
   • So panem ... esse is the reported statement

2. Passive periphrastic

   • secandum esse = must be cut / should be cut
   • This is formed with a gerundive
     • esse

So the whole phrase means:

• that the bread should not be cut immediately...

A very literal breakdown is:

• panem = the bread
• non statim = not immediately
• secandum esse = to need to be cut / to be needing to be cut

Because secandum is the gerundive of secare, and it must agree with panem in gender, number, and case.

• panem is masculine singular accusative
• so the gerundive must also be masculine singular accusative
• that form is secandum

This can confuse learners because -um often looks neuter, but here it is masculine accusative singular, which is perfectly normal for adjectives and adjective-like forms.

So:

• nominative masculine singular: secandus
• accusative masculine singular: secandum

Since the sentence has panem, not panis, the agreeing form is secandum.

Because secandum esse does not just mean to be cut or to cut. It adds the idea of necessity, obligation, or what ought to be done.

Compare:

• secare = to cut
• secari = to be cut
• secandum esse = to have to be cut / should be cut / must be cut

So if Latin used secari, the sentence would only say that the bread is cut or is to be cut in a neutral sense. But secandum esse expresses the stronger idea that cutting it this way is the proper or necessary thing to do.

Statim means immediately, at once, or right away.

So non statim means:

• not immediately
• not right away

It modifies the idea of cutting:

• panem non statim secandum esse = that the bread should not be cut right away

Latin adverbs like statim can often move around fairly freely, so the position is natural but not rigidly fixed.

Because in + accusative often expresses movement into something or a change of state/result.

Here the bread is being cut into pieces, so Latin uses:

• in partes = into parts / into pieces

This is different from in + ablative, which usually means in in the sense of location.

So:

• in partes = into pieces
• not in partibus, because this is not about location

The accusative makes sense because cutting changes the bread into smaller units.

Parvas agrees with partes, and nimis modifies parvas.

• partes = feminine accusative plural
• parvas = feminine accusative plural, agreeing with partes
• nimis = too, excessively

So:

• in partes nimis parvas = into pieces that are too small

A very literal reading would be:

• into too small parts

But natural English usually prefers:

• into pieces that are too small

Because quia here introduces a normal statement of fact: the reason Mother gives is presented as real and straightforward.

So Latin uses the indicative:

• quia pater magnum frustum semper petit
• because father always asks for a big piece

This is the ordinary, expected construction.

Also note:

• pater = subject
• magnum frustum = direct object
• semper = always
• petit = asks for / requests / seeks

They refer to different things:

• panem = the bread as a whole
• frustum = a piece, chunk, or slice broken off from something

So Mother is talking about how the whole bread should be cut, and the reason is that Father wants:

• magnum frustum = a big piece

This contrast is important to the sense:

• don’t cut the bread into very small pieces,
• because Father wants one large piece.

A good way is to divide it into three parts:

• Mater dicit
• panem non statim secandum esse in partes nimis parvas
• quia pater magnum frustum semper petit

The most important core inside the middle section is:

• panem ... secandum esse

Everything else adds extra information:

• non statim = not immediately
• in partes nimis parvas = into pieces that are too small

So you can read it as:

• Mother says
• that the bread should not be cut right away into very small pieces
• because Father always asks for a big piece

That is a very common Latin reading strategy: find the core construction first, then add the modifiers around it.

The sentence leaves the agent unstated because it is either obvious or unimportant.

The construction secandum esse focuses on what ought to happen, not on who must do it.

Latin can name the person responsible in this kind of construction, often with a dative of agent, for example:

• nobis panis secandus est = we must cut the bread / the bread must be cut by us

But in your sentence, no agent is given. The point is simply:

• the bread should not be cut into very small pieces

So Latin does not need to specify the cutter.