"The man of the future may, and even must, do things impossible in the past and acquire new motor variations not given by heredity"

"The tiger is a magnificent creature and one that is threatened by human activities on all fronts. It is up to us to protect this iconic species and ensure that it has a future in the wild"

"Mother love is the fuel that enables a normal human being to do the impossible"

"What is real is not the external form, but the essence of things... it is impossible for anyone to express anything essentially real by imitating its exterior surface"

"Forget the past - the future will give you plenty to worry about"

"Every time I see an adult on a bicycle, I no longer despair for the future of the human race"

"The best way to predict the future is to create it"

"It is impossible to begin to learn that which one thinks one already knows"

"The past is a memory, the future is a fantasy. The real, vibrant, creative moment is now"

"It is impossible to suffer without making someone pay for it; every complaint already contains revenge"

"Happy is the person who knows what to remember of the past, what to enjoy in the present, and what to plan for in the future"