תֵּצֵ֣א ר֭וּחוֹ יָשֻׁ֣ב לְאַדְמָת֑וֹ בַּיּ֥וֹם הַ֝ה֗וּא אָבְד֥וּ עֶשְׁתֹּנֹתָֽיו׃
Ujdzie duch jego, wróci do prochu swojego; w on dzień znikną zamysły jego.
Akeidat Yitzchak
Sunlight is a gift bestowed on everyone, yet, unless one is equipped to receive it through normal channels, one may not benefit from it. Anyone whose eyes are defective, may fail to benefit from the rays of the sun and remain blind. Torah, i.e. spiritual light, is provided for man, but it too requires channels that are primed to receive it, understand it and make use of it. Ner mitzvah, the commandment being a lamp, refers to the local illumination achieved through performance of an individual mitzvah, whereas Torah or, the Torah is Light itself, refers to the spiritual illumination provided by Torah in its entirety, since it has the ability to bathe the whole human personality in its spiritual light. Priming one's antenna, however is necessary, else the impact of all that spiritual light goes to waste. When we are told that the unborn infant is exposed to the total teachings of Torah, only to forget same the moment he is born, this means that while as yet unborn, man's potential is unimpeded by negative influences, and he can absorb all the spiritual light offered. Entry into our world however, poses a formidable screen, nullifying at least temporarily the lessons previously absorbed. Only application by man can restore the former ease for receiving Divinely inspired teachings. The infant is sworn to become a tzaddik and not a rasha. Whatever is acquired by man's intellect, is no more than the recollection of what he had learned while still in the womb of his mother. When one tells a wealthy man that he is rich, this does not prevent him from trying to amass still greater wealth. Similarly, when a person is told that he is a tzaddik, righteous person, he must continue to view himself as being almost a rasha, and keep up his efforts to become even more perfect spiritually. Our sages advise that one should strive for refinement of one's character traits with the same energy that one applies to the effort to acquire transient values. The soul has five characteristics that liken it to the Almighty. (Berachot 10) David praised G'd in respect of these five characteristics of the soul in Psalms 103 and 104. 1) G'd sees without being seen; similarly, the soul sees without being seen. 2) Just as G'd fills the universe, so the soul fills the body. 3) Just as G'd feeds the universe, so the soul feeds the body it inhabits. 4) Just as G'd is pure, so the soul is pure. 5) Just as G'd resides in the innermost chamber, so does the soul. May he who possesses the above five characteristics come and bless Him who possesses these five characteristics. We are commanded in Deut. 4,15, "take good care of yourselves, for you have seen no manner of form on the day the Lord spoke with you at Chorev out of the fire." This means that we are to kindle His light, the invisible one, to perfect it, so that G'd in turn who holds our life in His hands (your light) will preserve it. Concerning the soul sustaining the body, compare Psalms 146,4, "when his spirit departs, he returns to his soil." G'd is called the chay olamim, the "eternally living," in the words of Maimonides, since He is to the world what the soul is to the body. The essential difference between Jewish philosophy and that of other religions is that we believe that the soul starts out by being pure, and needs to be kept that way by means of observing G'ds commandments. This is facilitated by reverence for G'd, belief in His existence, His power etc. Other religions believe that man is equipped with a tainted soul, (due to the sin of original man) and has to be cleansed and purified. The order of the ten commandments supports the view of Solomon in Kohelet 12,13, "fear the Lord, and observe His commandments." First there has to be a fundamental reverence for the Lord, only afterwards can the observance of His commandments become meaningful. For that reason, the decalogue starts with the statements "I am the Lord your G'd," and "you must not have any other deities."
Duties of the Heart
(Answer further:) "And what is this world? Even if my name becomes known to the whole world, what is the measure of my days? Even if my name does go out to part of the world, certainly my memory will reach an even smaller part, and even then it will fade away after a short time and be forgotten as if it had never existed. And scripture says: 'The sons of men are but vanity, and men of distinction are a falsehood; were they to be put on a scale, together they would equal vanity' (Tehilim 62:10), and 'his breath leaves, he returns to his dust' (Tehilim 146:4), and 'there is no memory of the early ones' (Koheles 1:11)."