Nothing demands more caution than the truth: 'tis the lancet of the heart. It requires as much to tell the truth as to conceal it. A single lie destroys a whole reputation for integrity... Yet not all truths can be spoken: some for our own sake, others for the sake of others.
Baltasar Gracián, 1647 (tr. Joseph Jacobs, 1892)
This maxim holds two things most people split apart. Never lie: a single one destroys a whole reputation for integrity, and the deceiver is treated as a traitor, which no gain is worth. And never feel obliged to say everything: not all truths need speaking, some for your own protection and some out of care for the person who would be hurt by the full version. The distinction is between lying and selective silence. Lying is inventing a false picture; discretion is declining to volunteer every true detail. The skilled hold both: their word is completely reliable, and they are also careful about which truths they release, to whom, and when. Truth is an instrument, and instruments are used with judgment, not emptied indiscriminately.
Practice
- Draw the bright line: never state a falsehood, and separately, never assume you must disclose every true thing you know.
- Dose hard truths for the receiver: the feedback that helps in one sentence can crush in five; deliver what changes behaviour, not everything you observed (maxim 210 gilds the pill).
- When a truth is yours to keep, keep it without lying; "I'd rather not go into that" is honest, where a fabricated answer is not.
Use this when
- Use this in feedback, negotiation, and sensitive conversations, where the whole truth and the useful truth are different amounts.
- Use it to protect others where the full detail would wound without helping; care is a legitimate reason for silence, never for a lie.
Ignore this when
- Don't cross from selective silence into deception; the maxim's first half is absolute, and "technically not lying" while building a false impression breaks it (maxim 175 keeps the foundation real).
- Don't withhold truths that people have a right to and need to act; discretion is not a cover for hiding what harms them.
A picture of it
A manager must tell a capable employee that a promotion did not come through. The whole truth includes a senior's careless remark that would wound the employee and poison a working relationship for no benefit. She tells the true, useful version, the specific gaps to close and the timeline, and holds back the remark, which changes nothing except morale. She has not lied; every word is true. She has simply not emptied the whole lancet into a wound it would not heal. The employee leaves with a plan instead of a grievance, which is exactly what the dosed truth was for.
Never lie, and never say all of it. The whole truth and the helpful truth are rarely the same amount.