"... people will forget ...."

 

"I've learned that people will forget what you said, people will forget what you did, but people will never forget how you made them feel." 

"... I still have ...."

 

"I've learned that I still have a lot to learn." 

"... life sometimes gives you ...."

 

"I've learned that life sometimes gives you a second chance."

"... regardless of your relationship ...."

"I've learned that regardless of your relationship with your parents, you'll miss them when they're gone from your life."