Paul jogs the memory of the Thessalonians reminding them of his personal labor and toil, which consumed most nights and days. Paul and Co. had made a concerted effort to not add extra burdens to this group of believers, while proclaiming the good news of Christ. Biblical leadership requires selflessness; an effort to not be a burden to other believers, especially those experiencing pressure from persecution. Paul highlights optimal conduct of Christian leadership, which is to be holy, right and blameless. Previously Paul had cared for the Thessalonians as a mother cares for her nursing child, but now Paul cares for them as a father for his children exhorting, encouraging and charging his children to walk in a manner that is worthy of God. Why? Because God has called you into his own kingdom and glory.