There always will be homicides, tyrants, thieves, adulterers, ravishers, sacrilegious, traitors: worse than all these is the ungrateful man, except we consider that all these crimes flow from ingratitude, without which hardly any great wickedness has ever grown to full stature. Be sure that you guard against this as the greatest of crimes in yourself, but pardon it as the least of crimes in another. For all the injury which you suffer is this: you have lost the subject-matter of a benefit, not the benefit itself, for you possess unimpaired the best part of it, in that you have given it. Though we ought to be careful to bestow our benefits by preference upon those who are likely to show us gratitude for them, yet we must sometimes do what we have little hope will turn out well, and bestow benefits upon those who we not only think will prove ungrateful, but who we know have been so. For instance, if I should be able to save a man's children from a great danger with no risk to myself, I should not hesitate to do so. If a man be worthy I would defend him even with my blood, and would share his perils; if he be unworthy, and yet by merely crying for help I can rescue him from robbers, I would without reluctance raise the shout which would save a fellow-creature. XI. The next point to be defined is, what kind of benefits are to be given, and in what manner. First let us give what is necessary, next what is useful, and then what is pleasant, provided that they be lasting. We must begin with what is necessary, for those things which support life affect the mind very differently from, those which adorn and improve it. A man may be nice, and hard to please, in things which he can easily do without, of which he can say, "Take them back; I do not want them, I am satisfied with what I have." Sometimes, we wish not only to, return what we have received, but even to throw it away. Of necessary things, the first class consists of things without which we cannot live; the second, of things without which we ought not to live; and the third, of things without which we should not care to live. The first class are, to be saved from the hands of the enemy, from the anger of tyrants, from proscription, and the various other perils which beset human life. By averting any one of these, we shall earn gratitude proportionate to the greatness of the danger, for when men think of the greatness of the misery from which they have been saved, the terror which they have gone through enhances the value of our services. Yet we ought not to delay rescuing any one longer than we are obliged, solely in order to make his fears add weight to our services. Next come those things without which we can indeed live, but in such a manner that it would be better to die, such as liberty, chastity, or a good conscience. After these are what we have come to hold dear by connexion and relationship and long use and custom, such as our wives and children,