"Focus on YOU! Work on yourself, first and foremost!!" (Twitter, December 2015)
"I remember my sister Kourtney wasn't developing and I was. I used to sit in the bath tub and pray I wouldn't develop anymore. She would snap my bra strap and I was insecure in developing and then when I was leaving 8th grade my dad wrote me a letter and told me that I had been blessed with a certain body type but some men might take advantage of that but he wanted me to love my body. Be confident and secure and who you are, and if people around you aren't at the same speed as you or are different, that's okay." (Commonwealth Club speech, June 2015)
"Have lots of sex now because after you have a kid, it's hard to squeeze it in. Make time for each other or the connection can go away." (Shape, May 2011)
"I think women sometimes do it to themselves, but I also think that if you have the power, you can take that power and put out what you want people to look at and what you feel is beautiful." (Commonwealth Club speech, June 2015)
"It's important to ask a lot of questions and learn from others every day. I teach my kids to keep learning about new things—like right now Kourt is writing a book about being a mom, which I am really excited about. Building a successful business can start from a very small seed. You can take a dream and a vision and turn it into a business. The most successful businesses come from a place of passion." (Marie Claire, August 2014)
"Easing back into exercising is important. I started by taking walks with the baby and kids and I ate as organically as possible, but I also liked to include full-fat healthy foods as well. I eventually worked up to doing workout sessions five days a week with my trainer. If I am going to spend an hour in the gym, or even at home working out, it has to be effective, otherwise it's just not worth my time." (New Beauty, 2015)
"I used to be so dependent on the guys I was in a relationship with. I don't know why because I wasn't raised that way. If I looked at myself at 19, I would shake myself and be like, 'Wake up, you are way too smart for this.'" (Harper's Bazaar, February 2011)
"When you raise a family, it's amazing to have a support system of other women. I was 22 when I had my first baby—I didn't always know what I was doing and so I was so thankful for my girlfriends. Sometimes you are the student, sometimes you are the teacher. One of my only regrets now is that because I am so busy I don't get to see my friends as often as I would like. But with true friends it doesn't matter if you see them regularly or once in a while." (Marie Claire, August 2014)
"I think motherhood is just about instinct. I remember coming home from the hospital and having no idea what we were doing. Scott and I changed [Mason's] diaper together, but after a day, it was like, 'Oh, I got it.'" (Parenting, February 2011)
MORE PHOTOS: Kim Kardashian's quotes on motherhood