Your customer has a voice in their head. It narrates their day, argues with their spouse, negotiates their salary. Every word in that internal monologue carries weight, history, and identity.
Write in a different language and you create translation friction. They have to decode you before they can trust you. That lag is where you lose them.
David Ogilvy sold the same Rolls-Royce to a different person than the engineer who built it. The engineer knew torque ratios. Ogilvy knew the buyer was terrified of looking nouveau riche. "At 60 miles an hour, the loudest noise in this new Rolls-Royce comes from the electric clock." No jargon. No specs. One sensory detail aimed directly at the status anxiety running the decision. He sold the feeling of quiet, not the engineering behind it.
The mistake most people make: writing for themselves. They use the vocabulary they earned, the framing that makes sense inside their category, the precision that impresses peers. The reader does not care about your precision. They care about their problem.
Listen before you write. Pull the actual words your buyer uses to describe their situation. Not a synonym. Not an upgrade. The exact word. When someone says their team is "scattered," they do not mean "lacking alignment." Scattered has a texture. It means Monday morning chaos and missed Slack messages and nobody sure who owns the thing. Alignment is a consultant's translation. Scattered is theirs.
Use their word. Watch the friction disappear.
This goes deeper than vocabulary. People think in narrative structures specific to their context. A founder narrates life as a sequence of bets. A doctor as differential diagnoses. A soldier as terrain and threat assessment. Write to a founder using medical framing and something invisible but real misfires. The logic tracks but the resonance does not.
The French have a word for this: connivence. Shared understanding that does not need to be explained. When you write in someone's native cognitive language, you access that register. The reader feels seen without being able to articulate why. That feeling is trust. Trust is what moves decisions.
One test. Read your copy out loud and ask: would the person I'm writing for say this sentence in conversation? If the answer is no, rewrite it until yes. Zero translation cost. The message lands the way a sentence they would have written themselves lands: immediately, without effort, without resistance.
Speak their language and you disappear into the communication. That is exactly where you want to be.