What do these Chinese expressions mean?

The following is a list of expressions that I come across in my very unsystematic attempt to learn to read and understand Chinese expressions. I will be adding to the list as I come across expressions I find interesting or difficult to understand. By the way, I do not have English translations of these expression, so I am coming up with my own, which means there are probably better translations out there.

• 靑出於藍 (청출어람) - Blue (靑) comes (出) from (於) an indigo plant (藍).
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  Supposedly the dye that comes from an indigo plant is bluer than the plant, itself, so this expression supposedly implies that "a disciple is better than his teacher."
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• 富潤屋 德潤身 (부윤옥 덕윤신) - Riches (富) give luster to (潤) a house (屋); virtue (德) gives luster to (潤) a body (身).
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  I do not think there is a hidden meaning in this expression since it seems self-explanatory.
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• 子欲養而 親不待 (자욕양이 친부대) - A son (子) wants (欲) to serve his parents (養), but (而) his parents (親) do not (不) wait (待).
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  This sentence seems to be saying that sons who intend to care for his parents often do not get a chance because their parents die. I am not sure what this sentence had intended to teach, but I would guess that it was warning children not to wait, or wait too long, to serve their parents. By the way, in this expression, 養 (양) means 奉養하다 (봉양하다), which means "to serve (support) one's parents."