Charles Spurgeon Commentary Matthew 10:13

"And if the house be worthy, let your peace come upon it: but if it be not worthy, let your peace return to you." — Matthew 10:13 (ASV)

Think well of all until they prove by their conduct that your good opinion is an error. Bless the house, and if it is worthy, the Lord will make your blessing effectual and peace shall dwell there, but if the house is not worthy, the blessing shall, by your Lord’s ordinance, return to you, and that will enable you to bear the rebuff without being discouraged. We cannot judge worthiness, but the Lord will do so. We are to hope well of all. We shall get good even if we fail to do good. If the failure is through no fault of ours, it will be no failure to us.