St Paul’s instruction to fathers applies to all who have the charge of children: to schoolmasters of every degree, whose work, secular as it may be called, touches the springs of moral life and character; to teachers in the Sunday school, successors to the work that Christ assigned to Peter, of shepherding His lambs. These instructors supply the Lord’s nurture to multitudes of children, in whose homes Christian faith and example are wanting. The ideas which children form of Christ and His religion, are gathered from what they see and hear in the school. Many a child receives its bias for life from the influence of the teacher before whom it sits on Sunday. The love and meekness of wisdom, or the coldness or carelessness of the one who thus stands between Christ and the infant soul, will make or mar its spiritual future. II. From the children of the house the apostle proceeds to address the _servants_--slaves as they were, until the gospel unbound their chains. The juxtaposition of children and slaves is full of significance; it is a tacit prophecy of emancipation. It brings the slave within the household, and gives a new dignity to domestic service.[152] The Greek philosophers regarded slavery as a fundamental institution, indispensable to the existence of civilized society. That the few might enjoy freedom and culture, the many were doomed to bondage. Aristotle defines the slave as an “animated tool,” and the tool as an “inanimate slave.” Two or three facts will suffice to show how utterly slaves were deprived of human rights in the brilliant times of the classic humanism. In Athens it was the legal rule to admit the evidence of a slave only upon torture, as that of a freeman was received upon oath. Amongst the Romans, if a master had been murdered in his house, the whole of his domestic servants, amounting sometimes to hundreds, were put to death without inquiry. It was a common mark of hospitality to assign to a guest a female slave for the night, like any other convenience. Let it be remembered that the slave population outnumbered the free citizens of the Roman and Greek cities by many times; that they were frequently of the same race, and might be even superior in education to their masters. Indeed, it was a lucrative trade to rear young slaves and train them in literary and other accomplishments, and then to let them out in these capacities for hire. Let any one consider the condition of society which all this involved, and he will have some conception of the degradation in which the masses of mankind were plunged, and of the crushing tyranny that the world laboured under in the boasted days of republican liberty and Hellenic art.