it is not so much a question of simply if God calls you to go to a bar or jail but rather that you have grown enough in spirit to do any good in such sin sick places that makes the difference because God may lay it on your heart to want to help such people come to God but you must be weary of the enemy's snares for Satan can call you as well,and if you go to such places you must not partake of what is being indulged in as well as that you can stand firm for God in truth,so first know where you stand "spiritually" because remember there were those in the bible whom thought that they could handle casting out demons,but alas they couldn't because they had not grown in the spirit as I recall the demons spoke on this wise"I know paul I know peter,but who are you?" and afterward the demons humiliated them by disrobing them and scaring them away,the same principle is applied with bars and jails you must have more than just faith for helping people whom are confounded or in deep despair or of a reprobate mind,you must grow in spirit by reading the bible alongside the holy spirit,learning what is written,and knowing what is true,for if one goes to where sin is and trouble abounds,then ye know that you will be asked many a tough question or even some shall say snide remarks,trying to discredit your mission for God,one must be able to answer such questions and speak up against such stumbling blocks,for you must always realize that when going to a place of sin,hatred,and despair,that there will be those who shall desire you to looketh a fool,and those as well who shall not believe as you do,and so thereby it shall be difficult to reach them,and of course know when to speak and when not to speak,leave this to God to decide when you shall speak or not,for some if not many shall be as clams not willing to open themselves unto you for fear of what they do not know,as well as having hardened hearts because much has befallen them or have asked much of God,and cannot see how God hath helped them or even see if God exists,so do not run in haste to such places of sin,hatred,and despair,before knowing first that you have grown enough in spirit and truth,to be capable of suffering such places for the purpose of bringing a soul to God,but also be sure to know whom calls you,God or the devil,to do this think on this wise,does the calling urge you to do something in haste and urge you to buy or partake of something that you know you shouldn't? if this is the case then the devil hath called you so do not answer his call,does the calling urge you to be patient,compassionate,and urges you to not buy or partake of something that you know you shouldn't? then God is calling unto you,answer his call if ye be ready,for the difference simply put lies in what you are being urged to do if it be something easy and sinful then it is not of God,if it be something difficult,yet not sinful and is helpful to God,then it is of God,as you walk with God in time ye shall know whom calls you,what you can handle according to your spirit,and where ye are to go,have faith in God and God's word,and seek "Truth" "Love" and "Compassion" and ye can serve God knowing what you enter into and in what manner you are to serve God.