Divine precepts and shunning mortal sins; and to this he should apply himself with the assiduity of one who, if he stray therefrom, is lost; for the foundation of good breeding is virtuous behaviour. Know that the chief reason of existence is the endeavour after life everlasting and the right way thereto is the service of God: so it behoves thee to deal righteously with the people; and swerve not from this rubrick, for the mightier folk are in dignity, the more need they have of prudence and foresight; and indeed kings need this more than common folk, for the general cast themselves into affairs, without taking thought to the issue of them. Be thou prodigal both of thyself and thy treasure in the way of God and know that, if an enemy dispute with thee, thou mayst litigate with him and refute him with proof and ward thyself against him; but as for thy friend, there is none can judge between thee and him but righteousness and fair-dealing. Wherefore, choose thy friend for thyself, after thou hast proved him. If he be a man of religion, let him be zealous in observing the external letter of the Law and versed in its inner meaning, as far as may be: and if he be a man of the world, let him be free-born, sincere, neither ignorant nor perverse, for the ignorant man is such that even his parents might well flee from him, and a liar cannot be a true friend, for the word "friend"[FN#66] is derived from "truth,"[FN#67] that emanates from the bottom of the heart; and how can this be the case, when falsehood is manifest upon the tongue? Know, therefore, that the observance of the Law profits him who practices it: so love thy brother, if he be after this fashion, and do not cast him off, even if thou see in him that which thou mislikest; for a friend is not like a wife whom one can divorce and take again; but his heart is like glass; once broken, it cannot be mended. And God bless him who says: Be careful not to hurt men's hearts nor work them aught of dole, For hard it is to bring again a once estranged soul; And hearts, indeed, whose loves in twain by discord have been rent Are like a broken glass, whose breach may never be made whole. The wise say (continued she), "The best of friends is he who is the most assiduous in good counsel, the best of actions is that which is fairest in its result, and the best of praise is (not) that which is in the mouths of men." It is said also, "It behoves not the believer to neglect to thank God, especially for two favours, health and reason." Again, "He who honoureth himself, his lust is a light matter to him, and he who makes much of small troubles, God afflicts him with great ones: he who obeys his own inclination neglects his duties and he who listens to the slanderer loses the true friend. He who thinks well of thee, do thou fulfil his thought of thee. He who exceeds in contention sins, and he who does not beware of upright is not safe from the sword."