What life's lesson have you learned from a trial or challenge you have gone through?

Everyone has experienced problems and challenges in life. I was just wondering, what lessons have you learned about a trial or challenge that you have gone through that might help others? Did you recover completely? If you care to share, what was it - and how did you overcome? What would you recommend to the next person as a way to help them? Do you think it is important to offer your help when you see others dealing with issues, or do you think they have to handle it on their own? I have experienced many disappointments and challenges in my life, but I believe as a teacher, I can offer my assistance to my young students even when they don't "see" their way out on the other side. I always try to see the positive side in spite of the challenge. My motto - "The rain cannot last always, the sun has to come out and when it does...I'll be there waiting."