"To know and not to do, is not to know." - Confucius :-)
There is another saying which is similar:
知而不行,未知也
(zhī ér bù xíng, wèi zhī yě)
This translates roughly to:
"To know but not to act is not truly to know."
This line is often associated with Wang Yangming (王阳明), a Ming dynasty Neo-Confucian philosopher. He is well known for the doctrine of 知行合一 (zhī xíng hé yī), meaning "the unity of knowledge and action."
Wang believed that true knowledge necessarily leads to action, and that merely intellectual understanding without practice is incomplete or false.
Anyway, reminders are meant to be helpful. :-)