used to say that people's actions show their true intentions or beliefs more clearly than their words

دو صد گفته چون نیم کردار نیست
(always negative) to refuse to make even a slightest change to one's position, decision, etc.

کوتاه نیامدن
used to imply that people tend to forget about things or people that are no longer visible or present in their lives

از دل برود هر آنکه از دیده برفت
used to imply that one can never understand why people's personal preferences drastically differ from one another, especially when compared to that of one's own

سلیقهها متفاوتاند
used to refer to a situation that has completely changed in one's favor

وضع کاملا تغییر کرده است
used to advise individuals to adapt to local customs and practices when in an unfamiliar situation or culture

خواهی نشوی رسوا همرنگ جماعت شو
used to suggest that when something bad happens, other bad things often happen in quick succession or in large numbers, making the situation seem even worse
