What makes old age hard to bear is not the failing of one's faculties, mental and physical, but the burden of one's memories. W. Somerset Maugham
If life becomes hard to bear we think of a change in our circumstances. But the most important and effective change, a change in our own attitude, hardly even occurs to us, and the resolution to take such a step is very difficult for us. Ludwig Wittgenstein
This life of being a transient human being has gotten to a point when it's very hard to bear. Gerry Mulligan
What was hard to bear is sweet to remember. Hindi Proverb
What was hard to bear is sweet to remember. Portuguese Proverb
If murder is forgiven, Heaven will find it hard to bear. Traditional Proverb