Jiāo rén, jiāoxīn; jiāo huā, jiāo gēn.

交人交心, 澆花澆根。

Lit To communicate [with] people, open [your] heart, [just as when] watering flowers [you should] water [their] roots.

Fig To make friends, frankness and sincerity are the most important things.

Note [Technically a rhyme; the order of the two halves may be reversed.]

Topics COMMUNICATION FRANKNESS FRIENDSHIP rhyme SINCERITY