One may conceive light to spread successively, by spherical waves.

Christiaan Huygens

What a wonderful and amazing Scheme have we here of the magnificent Vastness of the Universe! So many Suns, so many Earths....

Christiaan Huygens

I believe that we do not know anything for certain, but everything probably.

Christiaan Huygens

The world is my country, science is my religion.

Christiaan Huygens

I do not mind at all that [Newton] is not a Cartesian provided he does not offer us suppositions like that of attraction.

Christiaan Huygens

I esteem his [Newton's] understanding and subtlety highly, but I consider that they have been put to ill use in the greater part of this work, where the author studies things of little use or when he builds on the improbable principle of attraction.

Christiaan Huygens

The rest of the planets have their dress and furniture, nay and their inhabitants too, as well as this Earth of ours.

Christiaan Huygens

I had not thought of this regular decrease of gravity, namely that it is as the inverse square of the distance; this is a new and highly remarkable property of gravity.

Christiaan Huygens

The power of this line [the cycloid] to measure time.

Christiaan Huygens