What do I care for your suffering? Pain, even agony, is no more than information before the senses, data fed to the computer of the mind. The lesson is simple: you have received the information, now act on it. Take control of the input and you shall become master of the output.
-- Sid Meier’s Alpha Centauri
How about I take control of my output and so master my input? Seems to work better for me.
What distinction are both of you making between “take control of” and “master”?
But beware, lest the input becomes master over you.
I think the implication is that, by default, the input is already your master, and this is an undesirable state of affairs.