“Whence do you have it that the terrestrial globe is so heavy? For my part, either I do not know what heaviness is, or the terrestrial globe is neither heavy nor light, as likewise all other globes of the universe. Heaviness to me (and I believe to Nature) is that innate tendency by which a body resists being moved from its natural place and by which, when forcibly removed therefrom, it spontaneously returns there. Thus a bucketful of water raised on high and set free, returns to the sea; but who will say that the same water remains heavy in the sea, when being set free there, does not move?”

— Galileo Galilei

Letter to Francesco Ingoli (1624)

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Galileo Galilei 70

Italian mathematician, physicist, philosopher and astronomer 1564–1642

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“I tell you that if natural bodies have it from Nature to be moved by any movement, this can only be circular motion, nor is it possible that Nature has given to any of its integral bodies a propensity to be moved by straight motion. I have many confirmations of this proposition, but for the present one alone suffices, which is this. I suppose the parts of the universe to be in the best arrangement, so that none is out of its place, which is to say that Nature and God have perfectly arranged their structure. This being so, it is impossible for those parts to have it from Nature to be moved in straight, or in other than circular motion, because what moves straight changes place, and if it changes place naturally, then it was at first in a place preternatural to it, which goes against the supposition. Therefore, if the parts of the world are well ordered, straight motion is superfluous and not natural, and they can only have it when some body is forcibly removed from its natural place, to which it would then return by a straight line, for thus it appears that a part of the earth does [move] when separated from its whole. I said "it appears to us," because I am not against thinking that not even for such an effect does Nature make use of straight line motion.”

Galileo Galilei (1564–1642) Italian mathematician, physicist, philosopher and astronomer

A note on this statement is included by Stillman Drake in his Galileo at Work, His Scientific Biography (1981): Galileo adhered to this position in his Dialogue at least as to the "integral bodies of the universe." by which he meant stars and planets, here called "parts of the universe." But he did not attempt to explain the planetary motions on any mechanical basis, nor does this argument from "best arrangement" have any bearing on inertial motion, which to Galileo was indifference to motion and rest and not a tendency to move, either circularly or straight.
Letter to Francesco Ingoli (1624)

“Nothing which consists of corporeal matter is absolutely light, but that is comparatively lighter which is rarer, either by its own nature, or by accidental heat. And it is not to be thought that light bodies are escaping to the surface of the universe while they are carried upwards, or that they are not attracted by the earth. They are attracted, but in a less degree, and so are driven outwards by the heavy bodies; which being done, they stop, and are kept by the earth in their own place.”

Johannes Kepler book Mysterium Cosmographicum

As translated and quoted by Bryant, ibid.
Mysterium Cosmographicum (1596), Astronomia nova (1609)

“What does cause depression of spirits? Heavy head and heavy heart, and no sufficient reason for either, that I know of.”

Lucy Larcom (1824–1893) American teacher, poet, author

Journal entry (2 March 1861), Ch. 5 : The Beginning of the War.
Lucy Larcom : Life, Letters, and Diary (1895)
Context: What does cause depression of spirits? Heavy head and heavy heart, and no sufficient reason for either, that I know of. I am out of doors every day, and have nothing unusual to trouble me; yet every interval of thought is clouded; there is no rebound, no rejoicing as it is my nature to rejoice, and as all things teach me to do. We are strange phenomena to ourselves, when we will stop to gaze at ourselves; but that I do not believe in; there are pleasanter subjects, and self is a mere speck on the great horizon of life.