Proverb: Komu se nelení, tomu se zelení

This proverb is a little machine, and once you see how it's built you'll never forget it. Komu se nelení, tomu se zelení rhymes so tightly it almost sings, and it packs in two of the hardest ideas in Czech syntax at once: a dative correlative (a "to-whom … to-that-one" frame where both pronouns sit in the dative) and a pair of impersonal reflexive verbs with no grammatical subject at all. The message is simple — hard work pays off — but the grammar is anything but. Let's take it apart.

Word by word

Literally, and awkwardly: "To-whom it-does-not-laze, to-that-one it-greens." The two halves are perfectly parallel, and every content word is either dative or impersonal.

Grammar in action 1: the komu … tomu dative correlative

The backbone is a correlative — a matched pair of pronouns that hook two clauses together, one in each half. Czech loves these: kdo … ten ("who … that one"), co … to ("what … that"), kdy … tehdy ("when … then"). What makes this one advanced is that both members appear in the dative case: the relative kdo ("who") becomes komu, and the demonstrative ten ("that one") becomes tomu. So the frame is "for whom X, for that one Y."

Why dative on both? Because the persons in this proverb aren't doing anything grammatically — things are happening to them. The dative is Czech's case for the person affected, the one on the receiving end. The diligent person doesn't "flourish"; rather, "it flourishes for them." Both the relative and its demonstrative anchor therefore land in the dative to match that role. The nominative version of this correlative frame — kdo … ten — is laid out on the ten … který correlative, and the dative form of kdo itself on kdo and co.

Grammar in action 2: nelení se — the impersonal reflexive

Here's the part with no English handle at all. Nelení se looks like it should have a subject, but it doesn't. The verb lenit ("to be lazy, to laze") is used impersonally with se: there is no "he" or "she" doing the lazing. The literal machinery is closer to "it does not laze" — a subjectless statement about the situation, with the affected person tucked into the dative (komu).

So the first half doesn't say "he is not lazy." It says something more like "for him there is no lazing" — the laziness (or its absence) is presented as a weather-like condition surrounding the dative person, not as an action he performs. This impersonal-reflexive pattern — subjectless verb + se + dative experiencer — is a genuinely Czech way of describing states, and English simply has to paraphrase it. The construction is on impersonal se and impersonal constructions.

Grammar in action 3: zelení se — "it turns green," i.e. it flourishes

The second half mirrors the first. Zelení se is the impersonal reflexive of zelenat se ("to be/turn green, to grow lush"), again with se and again subjectless: "for them it greens." The image is a garden or a field bursting into green — the reward of the diligent, made vivid and literal. The dative tomu names the lucky person for whom everything comes up green.

The metaphor is agricultural to its roots: in a farming society, "things turning green" was prosperity — sprouting crops, a lush plot, a good harvest. So "tomu se zelení" = "for that person, everything grows / thrives / pays off." English can't be literal here and reaches for things flourish for them, it all comes good for them, or plainly hard work pays off.

Grammar in action 4: the rhyme is the glue

The proverb survives because it is almost a jingle. Nelení and zelení rhyme on -elení — an all-but-perfect echo, differing in a single consonant (n vs. z). The parallel structure amplifies it: komu se nelení / tomu se zelení have identical rhythm, identical se, identical verb ending, so the two halves click together like two halves of a locket. This is why nobody has to understand the grammar to remember the saying — the sound carries it. It's also why the wording is completely fixed: change a word and the rhyme collapses, so the proverb resists paraphrase.

Usage and culture

You'll hear this as encouragement or gentle moralising — a parent to a foot-dragging child, a coach to a lazy trainee, or as a self-satisfied comment when someone's effort finally bears fruit. It's the sunny counterpart to the English you reap what you sow and the early bird catches the worm, though its imagery is specifically the flourishing green of a well-tended plot. It pairs naturally with its sibling proverb about early risers, Kdo dřív přijde, ten dřív mele, which uses the nominative kdo … ten version of the same correlative frame.

Common Mistakes

Key Takeaways

• The frame is a dative correlative: kdo → komu and ten → tomu, both in the dative because the persons are affected, not acting.
• Nelení se and zelení se are impersonal reflexive verbs — subjectless, fixed in the 3rd person, each carrying an obligatory se.
• The affected person lives in the dative (komu, tomu), the way it does with chce se mi, daří se mu, dýchá se špatně.
• The rhyme nelení / zelení and the mirror-image structure are what lock the saying in memory — and why its wording is unchangeable.