In the first sentence, "Never lie to someone who trusts you," emphasizes the importance of maintaining trust in a relationship. It implies that trust is a fragile bond, and once you've gained someone's trust, it's vital to uphold it by being honest and transparent. Lying can shatter trust irreparably, so it's a caution against betraying the faith others have in you.
The second sentence, "Never trust someone who lies to you," complements the first by highlighting the reciprocal nature of trust. If someone consistently lies to you, it suggests a lack of integrity and reliability. Trust is a two-way street, and entrusting someone who habitually lies is likely to lead to disappointment and further erosion of trust.
Together, these two sentences emphasize the symbiotic relationship between trust and honesty. They remind us that trust is built on a foundation of truthfulness and that it's essential to be trustworthy to earn and maintain the trust of others. In essence, this quote underscores the value of honesty and integrity in all relationships.