Saepe creat molles aspera spina rosas - Often the prickly thorn produces tender roses. (Ovid)

Saepe ne utile quidem est scire quid futurum sit - Often it is not even advantageous to know what will be. (Cicero)

Saepe stilum vertas - May you often turn the stylus (You should make frequent corrections.)

Sane ego te vocavi. Forsitan capedictum tuum desit - I did call. Maybe your answering machine is broken

Sapere aude! - Dare to be wise! (Horace)

Sapiens nihil affirmat quod non probat - A wise man states as true nothing he does not prove (don't swear to anything you don't know firsthand)

Sat sapienti - Enough for a wise man. (Plautus)

Satius est impunitum relinqui facinus nocentis, quam innocentem damnari - It is better that a crime is left unpunished than that an innocent man is punished. (Corpus Iuris Civilis)

Scio cur summae inter se dissentiant! Numeris Romanis utor! - I know why the numbers don't agree! I use Roman numerals!

Scito te ipsum - Know yourself

Scribere est agere - To write is to act

Sed quis custodiet ipsos custodes? - Who watches the watchmen? (Juvenal)

Sedit qui timuit ne non succederet - He who feared he would not succeed sat still. (For fear of failure, he did nothing.) (Horace)

Semper fidelis - Always faithful (US Marines Motto)

Semper Gumby - Always flexible (United States Air Forces, Europe, Contracting squadron motto)

Semper idem - Always the same thing. (Cicero)

Semper Letteris Mandate - Always get it in writing!

Semper paratus - Always ready (US Coast Guard Motto)

Semper Primus - Always first (US Army Pathfinder motto)

Semper ubi sub ubi ubique - Always wear underwear everywhere

Sequens mirabitur aetas - The following age will be amazed

Serva me, servabo te - Save me and I will save you. (Petronius Arbiter)

Si fallatis officium, quaestor infitias eat se quicquam scire de factis vestris - If you fail, the secretary will disavow all knowledge of your activities

Si fecisti nega! - If you did it, deny it (stonewall!)

Si finis bonus est, totum bonum erit - If the end is good, everything will be good (all's well that ends well)

Si fractum non sit, noli id reficere - If it ain't broke, don't fix it

Si hoc legere scis nimium eruditionis habes - Essentially it says, 'if you can read this, you're overeducated.'

Si post fata venit gloria non propero - If glory comes after death, I'm not in a hurry (if one must die to be recognised, I can wait)

Si tacuisses, philosophus manisses - If you had kept quiet, you would have remained a philosopher. (Boethius)

Si vis amari, ama - If you wish to be loved, love. (Seneca)

Sic ad nauseam - And so on to the point of causing nausea

Sic faciunt omnes - Everyone is doing it

Sic itur ad astra - Such is the path to the stars (i.e. gain reputation) (Vergil)

Sic volo, sic iubeo - I want this, I order this. (Juvenalis)

Silent enim leges inter arma - Laws are silent in times of war. (Cicero)

Sine die - Without a day (being set)

Sine ira et studio - Without anger or bias. (Tacitus)

Sine nobilitatis - Without nobility (SNOB)

Sit vis nobiscum - May the Force be with you

Sobria inebrietas - Sober intoxication

Sol omnibus lucet - The sun shines upon us all. (Petronius)

Solitudinem fecerunt, pacem appelunt - They made a desert and called it peace. (Tacitus)

Sona si latine loqueris - Honk if you speak Latin

Spectaculorum procedere debet - The show must go on

Spemque metumque inter dubiis - Hover between hope and fear. (Vergil)

Spero nos familiares mansuros - I hope we'll still be friends

Splendor sine occasu - Splendour without end

Stultum est timere quod vitare non potes - It is foolish to fear that which you cannot avoid. (Publilius Syrus)

Sub secreto - In secret

Sub silentio - In silence

Sub sole nihil novi est - There's nothing new under the sun

Subucula tua apparet - Your slip is showing

Suggestio veri, suggestio falsi - An intimation of truth, an intimation of falcity

Sui generis - Of one's own kind

Summa cum laude - With highest honor

Summam scrutemur - Let's look at the bottom line

Summum ius, summa iniuria - The extreme law is the greatest injustice. (Cicero)

Sumptus censum ne superet - Let not your spending exceed your income (live within your means)

Suo jure - In one's rightful place

Suos cuique mos - Everyone has his customs. (Gellius)

Sursum corda - (lift) up (your) hearts

Suum cuique pulchrum est - To each his own is beautiful. (Cicero)