“The natural gravitation of the body pulls down with it those of little mind, strangling and overwhelming them with the multitude of the fleshly elements. Blessed are they to whom it is given to resist with superior strength the weight that would pull them down, taught by the guiding lines of right instruction to leap upward from earth and earth-bound things into the ether and the revolving heavens.”

"I've Learned Some Things" (1977)
Variant translations:
One can look at the sky for hours
One can look for hours at the sea, at a bird, at a child
Living on this world is being one with it
Growing unbreakable roots into it
Translated as "There Is One Thing I Learned From What I Lived" by Sãleyman Fatih Akgãl at TC Turkish Poetry Pages
I've Learned Some Things (2008)
Context: A person can gaze at the sky for hours
Can gaze for hours at a bird, a child, the sea
To live on the earth is to become part of it
To strike down roots that won't pull free

Source: Memoirs of a Geisha

VII. On the Nature of the World and its Eternity.
On the Gods and the Cosmos

Epitaph he composed for himself a few months before he died, as quoted in Calculusː Multivariable (2006) by Steven G. Krantz and Brian E. Blank. p. 126
Unsourced variant: I used to measure the Heavens, now I measure the shadows of Earth. The mind belonged to Heaven, the body's shadow lies here.

As quoted in The Great Quotations (1971) edited by George Seldes, p. 366

Source: The Promised Land (1912), Ch. 10.

Poetical Portrait II
The Venetian Bracelet (1829)