There is a saying that goes,
有句俗话说：
"Experience is the extract of suffering. "
“经验是由痛苦中粹取出来的。”
In other words, only when one has lived through unpleasantness and difficulties,
换言之，吾人唯有经历过不愉快或困苦时，
will one have gained experience in life.
才会获得人生的经验。