Huygens’ principle states that:
Every point on a wavefront may be thought of as a source of secondary wavelets that spread out in that medium at the speed of light.
At that moment, the new wavefront is the forward envelope of the secondary wavelets.
Final answer:
Hence, the Huygens’ principle is stated as every point on a wavefront may be thought of as a source of secondary wavelets and the new wavefront is the forward envelope of the secondary wavelets.