וְנִשְׁמַרְתֶּ֥ם מְאֹ֖ד לְנַפְשֹׁתֵיכֶ֑ם כִּ֣י לֹ֤א רְאִיתֶם֙ כָּל־תְּמוּנָ֔ה בְּי֗וֹם דִּבֶּ֨ר יְהוָ֧ה אֲלֵיכֶ֛ם בְּחֹרֵ֖ב מִתּ֥וֹךְ הָאֵֽשׁ׃
Guardad pues mucho vuestras almas: <span class="x" onmousemove="Show('perush','El Rambam explica esta parte del versículo en el <b>1º Capítulo</b> de Las Leyes de los Fundamentos de la Torá.',event);" onmouseout="Close();">pues ninguna figura visteis</span> el día que el Señor habló con vosotros de en medio del fuego:
Mesilat Yesharim
Perhaps you will say: behold we see that the sages everywhere obligated a man to guard himself well and not put himself in danger even if he is a righteous person with many merits. For instance: "everything is in the hands of heaven except colds and heatstrokes" (Ketubot 30a) and the Torah says "you shall guard yourselves very carefully" (Devarim 4:15). Hence one should not decide to "trust in G-d" in all situations, and in the Talmud Yerushalmi (Berachot 3, see also Chulin 142a) they said: "even when performing a Mitzva!".
Mesilat Yesharim
But he is still not master over himself to keep his heart from being pulled by natural lusts so that they do not sway him to rationalize that certain things are permitted regarding the things whose evil is not so well known.
Mesilat Yesharim
For even though he strives to conquer his evil inclination and to subdue his lusts, he will not change his nature because of this. He will not be able to remove bodily lust from his heart. He will at most be able to subdue it and be governed by wisdom instead of it. But nevertheless the darkness of the physical will inevitably do its work to entice and seduce him.