Marcus Aurelius - on being in the here and now

"Never let the future disturb you. You will meet it, if you have to, with the same weapons of reason which today arm you against the present." - Marcus Aurelius

I think here 'reason' means the complete presence of awareness in a given moment. I have read some other of Marcus Aurelius' works and get a feeling that his usage of the word reason (which itself is a translation of some word in latin) is different from our usage of it (as of 2015). It probly means 'present moment awareness' or 'complete attention' or 'calm focus'.