"La langue peut cacher la vérité mais les yeux jamais."

Simplified Meaning:

When people talk, they can choose their words carefully and lie or say something that hides what they really think or feel. However, their eyes often show their true feelings because it's much harder to control eye expressions. For example, someone might say they are happy for a friend who got a promotion, but if they are secretly jealous, their eyes might reveal their true emotions through a sad or angry look. Imagine a student who tells their teacher they're confident about a test, but their eyes look worried and fearful; the teacher can probably see their anxiety. Eyes tend to show honest emotions like love, fear, anger, or excitement without saying a word. Taking this advice, it's important to be observant of others' eyes to understand their real feelings, and also be mindful that our own feelings might be shown through our eyes even if we try to hide them with words. If we want to communicate honestly, we should try to align our eyes and words to reflect the truth.