"One of the new things people began to find out in the last century was that thoughts--just mere thoughts--are as powerful as electric batteries--as good for one as sunlight is, or as bad for one as poison. To let a sad thought or a bad one get into your mind is as dangerous as letting a scarlet fever germ get into your body. If you let it stay there after it has got in you may never get over it as long as you live... surprising things can happen to any one who, when a disagreeable or discouraged thought comes into his mind, just has the sense to remember in time and push it out by putting in an agreeable determinedly courageous one. Two things cannot be in one place. "Where you tend a rose, my lad, A thistle cannot grow."
while she wanted to look neither to her past nor her future, she lived exclusively in both. They had took different paths, but they had journeyed, so she realized, together.
...but what makes earth feel like Hell is our expectation that it should feel like Heaven. Earth is Earth. Dead is dead. You'll find out for yourself soon enough. It won't help the situation for you to get all upset.