(If I were a video editor/splicer, I'd have made a video montage using his actual movie scenes, but as it is, I am just putting together written lines delivered by Robin Williams throughout his career.)
What Robin Might Say To Each of Us Now
I've always tried to make sense of things. There must be some reason I am as I am. As you can see, Madame Chairman, I am no longer immortal . There's never enough time. No time to stop and think, "What have I learned?" Try to stay in control. It's not as easy as it sounds. Is this the same for everyone? Are we all doing this to one another? This bickering and mocking? Can it be better than this? We're all in it together, making the same mistakes, getting into the same jams, having lousy Fridays over and over and over and over and over.... Even when you're squeaky clean, you can still fall in the mud .
As this boy grew older, his wound grew deeper. Until one day, life for him lost its reason. He had no faith in any man, not even himself. He couldn't love or feel loved. He was sick with experience. He began to die . You and I share a secret. We know how easy it is to kill someone . For years I've thought about killing myself. It's the only thing that kept me going .
But I tell you all today, I would rather die a man, than live for all eternity a machine . To be acknowledged for who and what I am, no more, no less. Not for acclaim, not for approval, but, the simple truth of that recognition. This has been the elemental drive of my existence, and it must be achieved, if I am to live or die with dignity . To be my own master. Such a thing would be greater than all the magic and all the treasures in all the world .
Hunger for hope may be worse than hunger for food . Today may be the beginning of the end... or the end of the beginning... or the beginning of the beguine . What we do know is that, as the chemical window closed, another awakening took place; that the human spirit is more powerful than any drug - and THAT is what needs to be nourished: with work, play, friendship, family. THESE are the things that matter. This is what we'd forgotten - the simplest things . People take pictures of the happy moments in their lives. Someone looking through our photo album would conclude that we had led a joyous, leisurely existence free of tragedy. No one ever takes a photograph of something they want to forget . And if these pictures have anything important to say to future generations, it's this: I was here. I existed. I was young, I was happy, and someone cared enough about me in this world to take my picture .
All of life is a coming home. Salesmen, secretaries, coal miners, beekeepers, sword swallowers, all of us. All the restless hearts of the world, all trying to find a way home. It's hard to describe what I felt like then. Picture yourself walking for days in the driving snow; you don't even know you're walking in circles. The heaviness of your legs in the drifts, your shouts disappearing into the wind. How small you can feel, and how far away home can be. Home. The dictionary defines it as both a place of origin and a goal or destination. And the storm? The storm was all in my mind .
Come away O human child To the waters and the wild With a fairy hand in hand, For the world's more full of weeping Than you can understand . It's not about understanding... it's about *not* giving up ! You'll have bad times, but it'll always wake you up to the good stuff you weren't paying attention to . The important thing to remember is not to go to pieces when that happens. You have to react like a man, calmly. You have to say to yourself, "Albert, you pierced the toast, so what? It's not the end of your life" . Things were hairy for awhile, but, oh, I'm in great shape now .
Mr. Meeks, time to inherit the earth . Death is not the enemy gentlemen. If we're going to fight a disease, let's fight one of the most terrible diseases of all, indifference . Thoreau said, "Most men lead lives of quiet desperation." Don't be resigned to that. Break out !
What, are you crying? You don't cry, all right? You keep your chin up. Come on, keep your chin up. Crying never helped anybody do anything, okay? You have a problem, you face it like a man . Please, don't worry so much. Because in the end, none of us have very long on this Earth. Life is fleeting. And if you're ever distressed, cast your eyes to the summer sky when the stars are strung across the velvety night. And when a shooting star streaks through the blackness, turning night into day... make a wish and think of me. Make your life spectacular. I know I did .
All you have to do is think one happy thought, and you'll fly like me . Pretty soon, you and me are going to be together again, huh? Yeah. Thirty years ain't that long. Besides, next Wednesday's our annual-versity. Yeah? Yeah. Stay alive. That's all I'm axskin' you . Stick around, chief. You ain't seen nothin' yet .
I'm history! No, I'm mythology! Nah, I don't care what I am; I'm free hee!  That's right, I'm history... I'm outta here. I got the lucky ticket home, baby. Rollin, rollin, rollin'... keep them wagons rollin', rawhide! 
Gentlemen, haven't we learned anything from the music of John Lennon? All we need is love . I love you with every cell, with every atom. I love you on a subatomic level . I love you without knowing how, or when, or from where. I love you straightforwardly without complexities or pride. I love you because I know no other way then this. So close that your hand, on my chest, is my hand. So close, that when you close your eyes, I fall asleep . I'd hug you but your body is over there . A whole human life is just a heartbeat here in Heaven. Then we'll all be together forever . And I'm hoping someday maybe you will join me here .
Source (character, movie)
 Hector (Being Human)
 Parry (The Fisher King)
 Dale Putley (Father's Day)
 Andrew Martin (Bicentennial Man)
 Walter Finch (Insomnia)
 Genie (Aladdin)
 Leslie Zevo (Toys)
 Dr. Sayer (Awakenings)
 Sy Parrish (One Hour Photo)
 Patch Adams (Patch Adams)
 Daniel (Mrs. Doubtfire)
 Adrian (Good Morning Vietnam)
 Alan Parrish (Jumanji)
 Jack (Jack)
 John Keating (Dead Poets Society)
 Peter Pan (Hook)
 Popeye (Popeye)
 Chris Nielson (What Dreams May Come)
 Vladimir (Moscow on the Hudson)
 Dr. Know (A.I. Artificial Intelligence)
 Phillip Brainard (Flubber)
 Jakob Heym (Jakob the Liar)
 Sean (Good Will Hunting)
 Armand (The Bird Cage)
 Rainbow Randolph (Death to Smoochy)