Only Truth can give true reputation: only reality can be of real profit. One deceit needs many others and so the whole house is built in the air and must soon come to the ground.
 
[Sola la verdad puede dar reputación verdadera, y la substancia entra en provecho. Un embeleco ha menester otros muchos, y así toda la fábrica es quimera, y como se funda en el aire es preciso venir a tierra.]

Baltasar Gracián y Morales (1601-1658) Spanish Jesuit priest, writer, philosopher

The Art of Worldly Wisdom [Oráculo Manual y Arte de Prudencia], § 175 (1647) [tr. Jacobs (1892)]
    (Source)

(Source (Spanish)). Alternate translations:

Nothing but truth can give a true Reputation; and nothing but substance turns to account. One cheat stands in need of a great many others, and by consequent, the whole building is but imaginary: and seeing it is founded in the air, it must of necessity fall to the ground.
[Flesher ed. (1685)]

Only truth can bestow a true reputation, and only solid character prove profitable; one fraud makes necessary another and more; and so the whole of what is built up is flimsy, and as it rests upon air, it is destined to return to earth.
[tr. Fischer (1937)]

Only the truth can give you a true reputation, and only substance is profitable. One act of deceit begets many others, and soon the whole ghastly construction, which is founded in the air, comes tumbling down.
[tr. Maurer (1992)]