It is a well attested fact that the ancient Romans had a deep appreciation for friendship. Here is a little collection of friendship quotes and phrases in Latin. They are good for mottos, ring inscriptions, engravings, tattoos - what have you. Curiously, they often translate well into the modern understanding of friendship, which means primarily being friends on FaceBook. For instance: Neque nullis sis amicis, neque multis - Do not be a friend of none or a friend of too many. I also decided to through in some basic words (amicus, amicitia etc.)
AMICI masc., AMICAE fem. -- FRIENDS
AMICI OPTIMI IN AETERNUM masc., AMICAE OPTIMAE IN AETERNUM fem. -- BEST FRIENDS FOREVER
AMICITIA -- FRIENDSHIP
AMICITIA AEQUALITAS -- FRIENDSHIP IS EQUALITY
AMICITIAS IMMORTALES ESSE OPPORTET -- FRIENDSHIPS SHOULD BE IMMORTAL
AMICO AMICUS -- FRIEND OF A FRIEND
AMICORUM COMMUNIA OMNIA -- FRIENDS SHARE EVERYTHING
AMICORUM EST ADMONERE MUTUUM -- FRIENDS AUGHT TO ADMONISH EACH OTHER
AMICUS ALTER IPSE -- A FRIEND IS ANOTHER SELF
AMICUS MAGIS NECESSARIUS, QUAM IGNIS ET AQUA -- FRIENDSHIP IS MORE ESSENTIAL THAN FIRE AND WATER
AMICUS masc., AMICA fem. -- FRIEND
AMICUS OPTIMUS masc., AMICA OPTIMA fem. -- BEST FRIEND
AMIVUS CERTUS IN RE INCERTA CERNITUR -- A TRUE FRIEND IS DISCOVERED IN TIMES OF UNCERTAINTY
CUM AMICO NON CERTANDUM AEMULATIONE -- DO NOT COMPETE IN A RIVALRY WITH A FRIEND
FELICITAS MULTOS HABET AMICOS -- LUCK HAS NUMEROUS FRIENDS
IDEM VELLE ET IDEM NOLLE EA DEMUM FIRMA AMICITIA EST -- TO HAVE THE SAME TASTES AND THE SAME DISLIKES -- THIS IN FACT IS THE BASIS OF LASTING FRIENDSHIP (A quote from Sallust)
IS EST AMICUS QUI IN RE DUBIA RE JUVAT, UBI RE EST OPUS -- HE IS A TRUE FRIEND, WHO, UNDER DOUBTFUL CIRCUMSTANCES, AIDS IN DEED WHEN DEEDS ARE NECESSARY (A quote from Plautus)
MORES AMICI NOVERIS, NON ODERIS -- KNOW WELL, BUT TAKE NO OFFENCE AT THE MANNERS OF A FRIEND
MULTAS AMICITIAS SILENTIUM DIREMIT -- SILENCE BROKE UP MANY FRIENDSHIPS
NEMO COGENDUS AMICUS -- NOBODY SHOULD BE FORCED TO BE A FRIEND
NEQUE NULLIS SIS AMICUS, NEQUE MULTIS -- AVOID BEING A FRIEND TO NON OR A FRIEND TO TOO MANY
NIHIL PRETIO PARCO, AMICO DUM OPITULOR -- I SPARE NO EXPENSE SO LONG AS I CAN SERVE MY FRIEND
NIL EGO CONTULERIM JOCUNDO SANUS AMICO -- THERE IS NOTHING WHICH, IN MY SENSES, I SHOULD PREFER TO A DEAR FRIEND (A quote from Horace)
NON SUNT AMICI, AMICI QUI DEGUNT PROCUL -- FRIENDS WHO SPEND TIME APART ARE NOT FRIENDS
NOVOS PARANS AMICOS, NE OBLIVISCERE VETERUM -- WHEN FINDING NEW FRIENDS DO NOT FORGET THE OLD ONES
OMNIA CUM AMICO DELIBERA, SED DE TE IPSO PRIUS -- CONSULT YOUR FRIEND ON EVERYTHING, BUT FIRST OF ALL ABOUT YOURSELF (A quote from Seneca)
PARVUM NON PARVAE AMICITIAE PIGNUS -- A LITTLE PLEDGE OF NO LITTLE FRIENDSHIP
UBI AMICI, IBI OPES -- WHERE THERE ARE FRIENDS, THERE IS WEALTH
UNUS DEUS, ET PLURES AMICI -- ONE GOD AND MANY FRIENDS
USQUE AD ARAS AMICUS -- A FRIEND TO THE ALTARS
VIRI INFORTUNATI PROCUL AMICI -- THE FRIENDS OF AN UNFORTUNATE MAN ARE FAR AWAY
See also Latin love quotes, Latin love quotes