The moment (with some feeling) is produced in a moment which is captured from an event happened in a process.
For example: You went playing with a man. Then, you suddenly got a
impulsive good feeling with the man in a snap-short of touching speech.
In this case, "playing" is a process, the
"touching speech" is an event, "moment" is the "snap-short" that you
appreciating his message and then the "impulsive good feeling" is the
wonderful in sudden (剎那的美)。
"wonderful in sudden" is a kind of mental
stimulus for making life more interesting but this exaggeration will
mislead us to read the truth or affect rational estimation.
The sustainable (non-impulsive) good feeling is come from different
processes and can reduce the risk of making wrong choice.
Finally, I think there is no conflict existing between "wonderful in sudden"和"sustainable (non-impulsive) good feeling".
[2012-07-12]