Happy emotions come and go, so do unhappy ones. These are, in themselves, not signs of suffering, potential or actual. They are signs of living.

giving up success and failure, 
there is nothing to regret

not distinguishing pain from suffering is itself suffering

to be utterly without hope is also to be utterly without despair

Earlier I wrote — “the peace that passeth understanding can’t be understood.”
What’s worse, it can’t be experienced.
Then what, we may ask, is it good for?
And, of course, the answer is — it’s good for Nothing.

suffering includes the vain hope that right now things can be other than they are

suffering comes from our attachment to preferences (or desires), not their occurrence

(with thanks to Seng-ts’an and Richard Clarke)

we can accept our pain without liking it even though the pain remains until it, as all things, passes

the peace that passeth understanding can’t be understood

without One, how does one
bear being without
some one in one’s life?

without guilt, regrets are nothing to regret; they’re just regrets

suffering can be seen as the embodiment of certain inopportune descriptions and explanations about life, particularly one’s own life

all things arise spontaneously; resisting this only perpetuates suffering

the notion that you are the author of your life, however popular and seemingly useful, is a basic ingredient in the recipe for suffering

the illusion of control is the most fundamental (and cruelest) illusion of all