This is a quote from an awe-inspiring woman named Hellen Keller, who despite her inability to see, hear or even speak, felt the beauty of the world and lived on to make this world a better place to live.
Every person in this world has a different perception of beauty. Different things evoke different emotions in different people. Some people might consider the sky filled with vibrant colors at the time of sunset as a miracle of nature- as if the God himself has painted the sky, while for some this might be another natural phenomenon which occurs every day and therefore see no beauty in it. Thus, there can be no standard definition of beauty and there can’t be anything tangible which can be described as ‘beautiful’ universally.