Happy is the man who can make others better, not merely when he is in their company, but even when he is in their thoughts!
Seneca, Letters, XI.9
O felicem illum, qui non praesens tantum,
sed etiam cogitatus emendat!
Seneca, a Roman Stoic Philosopher, in his Letter XI recommends that one imagines their own actions under the observation of a respected and virtuous man. But more than that, he imagines that you yourself should improve others even when you are absent by being in their thoughts.