The truth is generally seen, rarely heard; seldom she comes in elemental purity, especially from afar; there is always some admixture of the moods of those through whom she has passed. The passions tinge her with their colors wherever they touch her, sometimes favorably, sometimes the reverse.

[La verdad ordinariamente se ve, extravagantemente se oye; raras vezes llega en su elemento puro, y menos quando viene de lejos; siempre trae algo de mixta, de los afectos por donde passa; tiñe de sus colores la passión quanto toca, ya odiosa, ya favorable.]

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

The Art of Worldly Wisdom [Oráculo Manual y Arte de Prudencia], § 80 (1647) [tr. Jacobs (1892)]
    (Source)

(Source (Spanish)). Alternate translation:

Truth is more often seen than heard. Seldom does it reach us unalloyed, even less so when it comes from afar. It is always blended with the emotions it has passed through. Emotion taints everything it touches, making it odious or favorable.
[tr. Maurer (1992)]