醉过方知酒浓爱过方知情深
[zuì guò fāng zhī jiŭ nóng ài guò fāng zhī qíng shēn]
Saying that you need to drink alcohol to know its potency and need to have loved before knowing the depth of true love, reflects deep sentiments on experiencing both intoxicants (in literal and metaphoric forms), emphasizing the value understood after personal encounter with something intense.