Adam Clarke on Luke 9:55

Ye know not what manner of spirit ye are of - Ye do not consider that the present is a dispensation of infinite mercy and love; and that the design of God is not to destroy sinners, but to give them space to repent, that he may save them unto eternal life. And ye do not consider that the zeal which you feel springs from an evil principle, being more concerned for your own honor than for the honor of God. The disciples of that Christ who died for his enemies should never think of avenging themselves on their persecutors.