你有病我有药我没病不要药
[nĭ yŏu bìng wŏ yŏu yào wŏ méi bìng bù yào yào]
This is a clever wordplay that humorously implies if you have problems (illness), I have the solutions (medicine); if you're fine, then no solution is needed. It carries the sense of having just what one needs at the right moment.