I agree with everything that Rekna says; one of the verses from scripture I like to quote runs "I do not even judge myself." At the same time, we should not merely let them continue in their sin. I don't think it's appropriate to castigate random people on their street for their sins, but if you see a friend who is a Christian in a sinful lifestyle, or someone in your church if your in a certain sort of position in that church, you're not only allowed, but required to try and get them to repent.
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"Die Deutschen meinen, daß die Kraft sich in Härte und Grausamkeit offenbaren müsse, sie unterwerfen sich dann gerne und mit Bewunderung:[...]. Daß es Kraft giebt in der Milde und Stille, das glauben sie nicht leicht."
"The Germans believe that power must reveal itself in hardness and cruelty and then submit themselves gladly and with admiration[...]. They do not believe readily that there is power in meekness and calm."
-- Friedrich Nietzsche
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