日久见人心爱久见真心
[rì jiŭ jiàn rén xīn ài jiŭ jiàn zhēn xīn]
With long-term contact, both genuine intentions gradually come to light. In other words, over time and experiences shared, one can truly see whether a person loves sincerely or if the affection is merely superficial, expressing a longing or belief in the authenticity and test of time for true feelings