You may not be able to make yourself smarter, but you can at least sound smarter with Latin quotations.

Aestimes iudicia, non numeres.
You should weigh your options not count them. Legal Principle

Ars longa vita brevis.
Life is short, the art so long to learn. Hippocrates aphorism

Audacter calumniare, semper aliquid haeret.
Spread libel boldly some of it always sticks. Francis Bacon

Cato mirari se aiebat quod non ridere haruspex haruspicem cum videret.
Cato used to say that he was amazed one soothsayer could keep a straight face when he met another. Cicero

Dicebamus hesterno die? .
We were saying yesterday? Fray Luis de Leon on resuming his lectures after five years in prison.

Expedit esse deos, et, ut expedit esse, putemus.
It is expedient that there should be gods, and, since it is expedient, let us assume that there are. Ovid

Gratis anhelans, multo agendo nihil agens.
Puffing pointlessly, very busy doing nothing. Phaedrus

Alea iacta est.
The die is cast. Used most famously by Cesar on crossing the Rubicon to invade Gaul against the orders of the Senate

Ignotum per ignotius.
To explain something not understood by something even less understood. Latin expression

Imprimatur.
It may be printed. A censor’s permission, especially in the catholic church

In partibus infidelium.
In the lands of the infidel. Ecclesiastical term as of a bishop without a see in Christendom

Interdum stultus bene loquitur.
Occasionally a fool says something sensible. Proverb

Latrante uno, latrat statim et alter canis.
When one dog barks another immediately barks too. Proverb

Malo cum Platone errare quam cum istis vera sentire.
I would rather be wrong with Plato than right with those people. Cicero

Mandamus.
We order. Legal term

Mentis gratissimus error.
A most delightful wandering of the mind. Horace

Misere est tacere cogi quod copias loqui.
It’s wretched being forced to keep quiet about something one is bursting to tell. Pubilius Syrus

Mobilium* turba Quiritium.
A crowd of inconsistent citizens. Hence the origin of the word "mob’. Horace

Mutato nomine de te fabula narratur.
Change the name and the story is about you. Horace

Nec audiendi qui solent dicere, "vox populi vox dei", quum tumultuositas vulgi semper insaniae proxima sit.
Those who keep saying ?the voice of the people is the voice of the gods? should not be listened to since the turbulence of the crowd is always very near to madness. Alcuin

Nescire quod antea quam natus sis acciderit, id est semper esse puerum; quid enimest aetas hominis nisi memoria rerum nostrarum cum superiorum aetate contexerit?
To be ignorant of what occurred before one’s birth is to be always a child, for what is adult life unless memory enables us to compare the events of our own time with those of earlier periods’ Cicero

Nescis, mi fili, quantula sapientia gubernatur mundus?
Do you know my son, with how little wisdom the world is governed? Count Oxentierna

Nihil simile est idem.
Things similar are not identical. Latin proposition

Nobis cum semel occidit brevis lux, nox est perpetua una dormienda.
When our brief day is done, we must sleep through a single endless night. Catullus

Non ego ventosae venor suffragia plebis.
I do not pursue the votes of the fickle masses. Horace

Odering dum metuant.
Let them hate me, provided they fear me. Cicero, Suetonius.

Odi profanum vulgus et arceo.
I hate and spurn the common crowd. Horace

Omnium consensu capax imperii nisi imperasset.
Universally judged fit to rule- until he ruled. Tacitus about Emperor Galba

Ovis ovem sequitur.
One sheep follows another. Proverb

Petitio principii. Begging the question.
Logical fallacy, assuming the conclusion to be proved, as a premise

Populus vult decipi. Decipiatur.
The people wish to be deceived, let them be deceived. Cardinal Caraffa

Post hoc, ego propter hoc.
After this and therefore because of this.

Si parva lecit componere magnis.
If one may compare small things with great. Virgil

Solitudine faciunt, pacem appellant.
They make a desert and they call it peace. Tacitus

Splendide mendax.
Gloriously false. Horace

Stat sua cuique dies; breve et irreparabile tempus omnibus est vitae; sed famam extendere facti, hoc virtutis opus.
Everyman has his appointed day; to all men a short and unalterable span of life; but by deeds to extend our fame, this is virtue’s task. Virgil

Suave mari magno turbantibus aequora ventis e terra magnum alterius spectare laborem.
It is agreeable, when out at see the winds are whipping up they waves, to watch from shore another?s troubles. Lucretius

Sublime feriam sidera vertice.
In exaltation, I shall smite the stars. Horace

Tantum bona valent quantum vendi possunt.
Things are worth precisely what they can be sold for.