Sorry to be the bearer of bad news but death is coming. And soon. But that's not as depressing as it sounds when you really think about it, like these great writers have. Most of these quotes on death (except for Chekhov's because he's a grumpy old so and so) will make you feel better about life.
"In spite of everything I still believe that people are really good at heart. I simply can't build up my hopes on a foundation consisting of confusion, misery and death."
"I feel monotony and death to be almost the same."
"How surely are the dead beyond death. Death is what the living carry with them. A state of dread, like some uncanny foretaste of a bitter memory. But the dead do not remember and nothingness is not a curse. Far from it."
"I discovered to my joy, that it is life, not death, that has no limits."
"Here was a man who now for the first time found himself looking into the eyes of death--who was passing through one of those rare moments of experience when we feel the truth of a commonplace, which is as different from what we call knowing it, as the vision of waters upon the earth is different from the delirious vision of the water which cannot be had to cool the burning tongue. When the commonplace 'We must all die' transforms itself suddenly into the acute consciousness 'I must die--and soon,' then death grapples us, and his fingers are cruel; afterwards, he may come to fold us in his arms as our mother did, and our last moment of dim earthly discerning may be like the first."
"A normal human being does not want the Kingdom of Heaven: he wants life on earth to continue. This is not solely because he is "weak," "sinful" and anxious for a "good time." Most people get a fair amount of fun out of their lives, but on balance life is suffering, and only the very young or the very foolish imagine otherwise. Ultimately it is the Christian attitude which is self-interested and hedonistic, since the aim is always to get away from the painful struggle of earthly life and find eternal peace in some kind of Heaven or Nirvana. The humanist attitude is that the struggle must continue and that death is the price of life."
"The idea of a good society is something you do not need a religion and eternal punishment to buttress; you need a religion if you are terrified of death"
"Be sure the safest rule is that we should not dare to live in any scene in which we dare not die. But, once realise what the true object is in life — that it is not pleasure, not knowledge, not even fame itself, 'that last infirmity of noble minds' — but that it is the development of character, the rising to a higher, nobler, purer standard, the building-up of the perfect Man — and then, so long as we feel that this is going on, and will (we trust) go on for evermore, death has for us no terror; it is not a shadow, but a light; not an end, but a beginning!"
"Are not the thoughts of the dying often turned towards the practical, painful, obscure, visceral aspect, towards the "seamy side" of death which is, as it happens, the side that death actually presents to them and forces them to feel, and which far more closely resembles a crushing burden, a difficulty in breathing, a destroying thirst, than the abstract idea to which we are accustomed to give the name of Death?"