"Ninety per cent of the world's woe comes from people not knowing themselves, their abilities, their frailties, and even their real virtues. Most of us go almost all the way through life as complete strangers to ourselves - so how can we know anyone else?"

This quote by Sydney J. Harris talks to the concept that an absence of self-awareness can result in a lot of suffering on the planet. He suggests that most of us go through life without actually comprehending ourselves, our strengths and weak points, and our true virtues. Without this understanding, it is difficult to genuinely understand others. Harris suggests that if we can learn to understand ourselves better, we can reduce the quantity of suffering on the planet. This quote encourages us to take the time to review who we are and how we can use our strengths and weak points to make the world a much better place. By understanding ourselves, we can much better understand and feel sorry for others.