Always say something that you have experienced, physically, mentally and spiritually. Cause you will never understand and you will only understand once you have gone through with it.
If you only read it in a book, you may have increased the level of your knowledge, but you cant explain the exact situation cause you never experienced it in the first place.
I always have this believe that a good advise may come from the brokenhearted people, from a terrible stranger, from a cripple you are sitting with in the bus, who knows. Cause they knew something you might dont even know.
That is why, we need to learn a lot. Learn not only from the book, learn from the world, from our life, from whatever opportunities that cross our path, we might learn some lessons.
Peace.