I have written this work not to teach men what they do not know, but to remind them of what they already know and is very evident to them, for you will find in most of my words only things which most people know, and concerning which they entertain no doubts. But to the extent that they are well known and their truths revealed to all, so is forgetfulness in relation to them extremely prevalent. It follows, then, that the benefit to be obtained from this work is not derived from a single reading; for it is possible that the reader will find that he has learned little after having read it that he did not know before. Its benefit is to be derived, rather, through review and persistent study, by which one is reminded of those things which, by nature, he is prone to forget and through which he is caused to take to heart the duty that he tends to overlook.
A consideration of the general state of affairs will reveal that the majority of men of quick intelligence and keen mentality devote most of their thought and speculation to the subtleties of wisdom and the profundities of analysis, each according to the inclination of his intelligence and his natural bent. There are some who expend a great deal of effort in studying the creation and nature. Others devote all of their thought to astronomy and mathematics, and others to the arts. There are those who go more deeply into sacred studies, into the study of the holy Torah, some occupying themselves with Halachic discussions, others with Midrash and others with legal decisions. There are few, however, who devote thought and study to perfection of Divine service - to love, fear, communion and all of the other aspects of saintliness. It is not that they consider this knowledge unessential; if questioned each one will maintain that it is of paramount importance and that one who is not clearly versed in it cannot be deemed truly wise. Their failure to devote more attention to it stems rather from its being so manifest and so obvious to them that they see no need for spending much time upon it. Consequently, this study and the reading of works of this kind have been left to those of a not too sensitive, almost dull intelligence. These you will see immersed in the study of saintliness, not stirring from it. It has reached the stage that when one sees another engaging in saintly conduct, he cannot help but suspect him of dullwittedness. This state of affairs results in evil consequences both for those who possess wisdom and for those who do not, causing both classes to lack true saintliness, and rendering it extremely rare. The wise lack it because of their limited consideration of it and the unwise because of their limited grasp. The result is that saintliness is construed by most to consist in the recitation of many Psalms, very long confessions, difficult fasts, and ablutions in ice and snow - all of which are incompatible with intellect and which reason cannot accept.
Truthful, desirable saintliness is far from being conceptualized by us, for it is obvious that a person does not concern himself with what does not occupy a place in his mind. And though the beginnings and foundations of saintliness are implanted in every person's heart, if he does not occupy himself with them, he will witness details of saintliness without recognizing them and he will trespass upon them without feeling or perceiving that he is doing so. For sentiments of saintliness, fear and love of God, and purity of heart are not so deeply rooted within a person as to obviate the necessity of his employing certain devices in order to acquire them. In this respect they differ from natural states such as sleep and wakefulness, hunger and satiety, and all other reactions which are stamped in one's nature, in that various methods and devices are perforce required for their acquisition. There is also no lack of deterrents which keep saintliness at a distance from a person, but then again there is no lack of devices by which these deterrents may be held afar. How, then, is it conceivable that it not be necessary to expend a great deal of time upon this study in order to know these truths and the manner in which they may be acquired and fulfilled? How will this wisdom enter a person's heart if he will not seek it? And since every man of wisdom recognizes the need for perfection of Divine service and the necessity for its purity and cleanliness, without which it is certainly completely unacceptable, but repulsive and despised - "For God searches all hearts and understands the inclination of all thoughts" (I Chronicles 28:9) - what will we answer in the day of reproof if we weaken in this study and forsake that which is so incumbent upon us as to be the very essence of what the Lord our God asks of us? Is it fitting that our intelligence exert itself and labor in speculations which are not binding upon us, in fruitless argumentation, in laws which have no application to us, while we leave to habit and abandon to mechanical observance our great debt to our Creator? If we do not look into and analyze the question of what constitutes true fear of God and what its ramifications are, how will we acquire it and how will we escape wordly vanity which renders our hearts forgetful of it? Will it not be forgotten and go lost even though we recognize its necessity? Love of God, too - if we do not make an effort to implant it in our hearts, utilizing all of the means which direct us towards it, how will it exist within us? Whence will enter into our souls intimacy with and ardor towards the Blessed One and towards His Torah if we do not give heart to His greatness and majesty which engender this intimacy in our hearts? How will our thoughts be purified if we do not strive to rescue them from the imperfections infused in them by physical nature? And all of the character traits, which are in such great need of correction and cultivation -who will cultivate and correct them if we do not give heart to them and subject them to exacting scrutiny?
-Rabbi Moshe Hayyim Luzzatto (Ramhal), the introduction to Mesilat Yesharim.