苟日新，日日新，又日新 If new for one day, then new day after day, and new again. The inscription on the bathing basin of King Tang, quoted in the Great Learning.
穷则变，变则通，通则久 When things reach their limit, they change. Change opens a way through, and a way through lasts. From the Book of Changes.
与时俱进 To advance with the times. Reports on the 16th Party Congress in November 2002 said that its revision of the Party Constitution carried the spirit of advancing with the times.