逢場作戲不必當真
[féng cháng zuò xì bù bì dāng zhēn]
The phrase suggests that life is like putting on performances where you do not have to take everything seriously ('Every occasion is acting, do not take it too sincerely'). It embodies an outlook on life or social interaction advocating not to get overly involved in temporary settings because nothing lasts forever, and all moments should be approached casually without attachment.