Blame not this ball, impelled by bat’s hard blows,
That now to right and now to left it goes,
That One who wields the bat and smites the strokes
He knows what drives thee, yea He knows, He knows.

Omar Khayyám (1048-1123) Persian poet, mathematician, philosopher, astronomer [عمر خیام]
Rubáiyát [رباعیات] [tr. Whinfield (1882), # 204]
    (Source)

This metaphor of life as a polo game appears in some translations of the Rubaiyat (particularly FitzGerald), but not in the Bodleian manuscript.

Alternate translations:

The Ball no Question makes of Ayes and Noes,
But Right or Left as strikes the Player goes;
And He that toss'd Thee down into the Field,
He knows about it all -- He knows -- HE knows!
[tr. FitzGerald, 1st ed. (1859), # 50]

The Ball no Question makes of Ayes and Noes,
But Right or Left as strikes the Player goes;
And He that toss'd you down into the Field,
He knows about it all -- HE knows -- HE knows!
[tr. FitzGerald, 2nd ed. (1868), # 75; 3rd ed. (1872), 4th ed. (1879), 5th ed. (1889 ed.), # 70]

Man, like a ball, hither and thither goes,
As fate's resistless bat directs the blows;
But He, who gives thee up to this rude sport,
He knows what drives thee, yea, He knows, He knows!
[tr. Whinfield (1883), # 401]

Oh thou who art driven like a ball, by the bat of
Fate, go to the right or left -- drink wine and say
nothing, for that One who flung thee into the run
and search (mêlée) he knows, he knows, he knows, he -- .
[tr. Garner (1895 ms)]

O thou who art gone to the club of fate like a ball!
Go to the left and to the right; but say nothing;
For He that threw thee down amidst the galloping,
He knows, and He knows, and He knows, and He --
[tr. Rodwell (1931) # 50/70]

Whirling like a ball before the mallet of Fate, go running to right and left, and say nothing; for he that hurled thee into the chase, He knows, and He knows, and He knows!
[tr. Bowen (1976), # 43]

Do not despair because to left and right
Fate drives you onward with his ballet-blows,
For He who flung you out into the fray,
He knows the game's technique -- He knows, He knows.
[tr. Bowen (1976), # 43]

In the cosmic game of polo you are the ball
The mallet’s left and right becomes your call
He who causes your movements, your rise and fall
He is the one, the only one, who knows it all.
[tr. Shahriari (1998), literal]

In the cosmic there is a flow
To which you must submit and bow
And though you act in this show
And seem to move to and fro
The plot you’ll never get to know
The only way you get to grow
Align yourself with this flow.
[tr. Shahriari (1998), figurative]