For this cause I also, when I couldn't stand it any longer, sent that I might know your faith, for fear that by any means the tempter had tempted you, and our labor would have been in vain.
Lest by some means - Either by allurements to apostasy, set before you by your former pagan friends; or by the arts of false teachers; or by the severity of suffering. Satan has many methods of seducing people from the truth, and Paul was fearful that by some of his arts he might be successful there.