Some of the greatest highs of your life, where you literally feel your heart swelling within your chest with pride, will be given to you by your children.
The deepest lows of your life, when you question your personal values, moral values, and basic intelligence will come as a result of your children.
Defining image of a parent: picture yourself lying in bed, sleep eluding you, at about 1:00 a.m., thinking "Did I do/say the right thing???" or even better, lying in bed, at about 1:00 a.m., with tears running into your ears while you think you are the most evil human being on earth because you had to hold your ground with a pre-teen ...