The notes here are taken from the actual Scala, so be warned that references to the "previous" proverb refer to its order in the Scala, not its order here. You can read more about the word at the Verbosum blog: IN.
in re = re: ~ Note: Yes, this is the "re:" that you see used in the subject line of memos and emails.
Est modus in rebus. ~ Note: The word "modus" here expresses the idea of a limit or a measure, as in the English word "moderation." The idea is that there is a limit to things, a measure that is proper to each thing.
Pars est in toto, sed totum non est in parte.
Terra es, et in terram ibis. ~ Note: You can see this phrase represented as a "word rebus" here: image.
Nihil in terra sine causa fit. ~ Note: You can find these words in the Biblical book of Job, 5.
Solus in pluribus.
Vive in diem. ~ Note: We use a slightly different idiom to express this idea in English: live for the day, live for today. This is one of the sayings Erasmus included in his Adagia, 1.8.62.
In tuum ipsius caput. ~ Note: This is one of the sayings Erasmus included in his Adagia, 4.6.88.
In aqua scribis. ~ Note: This is one of the sayings that Erasmus included in his Adagia, 1.4.56.
Omnis in modo est virtus. ~ Note: This builds on the idea of moderation, arguing that the whole notion of virtue itself consists of recognizing and staying within the limits of things. The word "omnis" here is an adjective modifying the subject, virtus, but you might best translate it with an adverb in English: Virtue consists entirely of moderation. Latin often prefers to use an adjective to modify the subject of a sentence where in English we might use an adverb instead.
In mari aquam quaeris. ~ Note: This is a proverbial fool's errand. Compare the English saying, "Not being able to see the forest for the trees." This is one of the sayings Erasmus collected in his Adagia, 1.9.75.
In medio stat virtus. ~ Note: In other words: virtue does not go to extremes!
in medias res ~ Note: This Latin phrase refers to a literary technique of plunging the audience into the middle of the action - note the accusative with "in" here, meaning "into." You can read more about this literary technique at Wikipedia.
Ducis in consilio posita est virtus militum.
Oculi sunt in amore duces. ~ Note: This saying can be found in Propertius, Elegies 2.15.
Sic erat in fatis.
In loco parentis ~ Note: This is another Latin phrase you will still find used in English. I work at a university and the degree to which the university needs to function "in loco parentis" for its students is a topic that often comes up! For more, see the Wikipedia article.
Nec satis rationis in armis. ~ Note: The word satis can take a genitive complement, as here: satis rationis, "enough (of) reason." You can find these words in Vergil's Aeneid, 2: arma amens capio; nec sat rationis in armis.
In hoc signo vinces.
Anima in amicis una. ~ Note: This is a motto of the Powell family.
Quam bene valere, melius in vita nihil. ~ Note: Notice that the expression of the comparison (quam) comes before the actual comparative word (melius), which is a word order we really cannot manage in English. Also, the indeclinable word "nihil" is regarded as a neuter noun, hence the neuter form "melius."
In omnia paratus. ~ Note: This is the motto of the United States Army's 18th Infantry Regiment.
In horam vivo. ~ Note: Although Latin "hora" means "hour" it also refers to time in general, and the "seasons" of time as they pass. The Horae, personified, were goddesses who watched over the passage of time and the changing of the seasons.
Aliud in ore, aliud in corde. ~ Note: This is another of those "aliud…aliud" sayings: One thing on the lips, another thing in the mind. This warns you to watch out for hypocritical people who say one thing and think another.
Quod in corde, hoc in ore. ~ Note: This is the flipside of the previous saying, this time praising the person who says what they think: What is in their mouth is that which is in their heart (on their mind, etc.).
Multum in parvo. ~ Note: Wikipedia informs me that this phrase is associated with the pug dog!
Magnum in parvo. ~ Note: This is, appropriately enough, a motto of the Little family!
In medio mari quaeris undas. ~ Note: Compare the other fool's errand you already saw: In mari aquam quaeris.
In me omnis spes est mihi. ~ Note: The words are from Terence's Phormio.
Contra spem in spem credidit. ~ Note: These words also come from Paul's letter to the Romans, 8.
In corde spes, vis et vita. ~ Note: You can see this motto on a memorial medallion here: image.
Vultus in hostem. ~ Note: This is a motto of the Codrington family.
Qui iacet in terra non habet unde cadat.
Rex, in aeternum vive! ~ Note: These words are spoken by Daniel to King Nabuchodonosor in the Bibilcal Book of Daniel, 3.
Non in omnes omnia conveniunt. ~ Note: This is another way of expressing the same idea as in the previous proverb: Not all things (omnia) are suitable for all people (omnes).