Latin quote · Growth

Qui non proficit, deficit

“He who does not go forward falls behind.”

Medieval Latin proverb

Translation

What does “Qui non proficit, deficit” mean?

Qui non proficit, deficit translates as “He who does not go forward falls behind.”

There is no standing still: if you are not growing, you are slipping back. It encourages continuous improvement in skill, faith or character.

Word by word

“Qui non proficit, deficit” word by word

Latin	English	Grammar
Qui	he who, whoever	nominative singular masculine of the relative pronoun qui, quae, quod; subject of the first clause
non	not	adverb of negation, placed before the verb it negates
proficit	makes progress, goes forward	3rd person singular present indicative active of proficio, “I advance, make progress”
deficit	falls short, falls away, fails	3rd person singular present indicative active of deficio, “I fail, am lacking, fall away”

Pronunciation

How to pronounce “Qui non proficit, deficit”

Classical Latinkwee nohn PROH-fih-kit DEH-fih-kit

Church Latinkwee nohn PROH-fee-chit DEH-fee-chit

The two pronunciations differ only in the c of proficit and deficit, which is a hard k in Classical and a soft ch in Church Latin. Stress falls on the first syllable of both verbs: PROH-fih-kit, DEH-fih-kit.

Origin & context

The story behind it

Word for word the saying runs “who does not advance, falls away”. The two verbs, proficit and deficit, belong to the same family and make a neat contrast: pro- means “forward” and de- means “away, down”.

It is a medieval Latin proverb and no single author can be named for it. It is associated with monastic spirituality, where steady progress in virtue was expected and standing still was treated as a kind of decline.

The idea lives on in the English saying that if you are not moving forward, you are moving backward, and the Latin is still quoted in schools, training programmes and in talk about self-improvement.

When to use it

How to use “Qui non proficit, deficit”

A good motto for a gym, a classroom, a learning journal or a team that wants to keep improving. It also suits a personal goal card or a tattoo for someone who values constant effort.

Latin: Qui non proficit, deficit
English: He who does not go forward falls behind.
Source: Medieval Latin proverb
Era: Middle Ages
Theme: Growth

Good to know

Common mistakes

It is a medieval proverb, not a line from a classical author such as Cicero or Seneca. Avoid giving it a famous name.
Deficit here is a verb meaning “he fails or falls back”. It is not the English noun “deficit”, although the English word comes from the same Latin verb.
Do not write proficet or deficet. The present-tense endings are -it, and proficit and deficit are the correct forms.
To address one person directly, you would need a different form (for example Si non proficis, deficis). The saying as given speaks of “he who”.

FAQ

Questions about “Qui non proficit, deficit”

What does “Qui non proficit, deficit” mean literally?

Literally, “who does not advance, falls away”. In natural English: whoever does not make progress is losing ground.

Who said “Qui non proficit, deficit”?

No author is known. It is a medieval Latin proverb associated with monastic spirituality, so it should be cited as a proverb rather than credited to a person.

How do you pronounce “Qui non proficit, deficit”?

In Classical Latin: kwee nohn PROH-fih-kit DEH-fih-kit. In Church Latin the c is soft: kwee nohn PROH-fee-chit DEH-fee-chit.

Is “Qui non proficit, deficit” correct Latin for a tattoo?

Yes. Both verbs are correctly formed 3rd person singular present forms, and the grammar is sound. Keep the comma and spelling exactly as given.

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