This attitude toward matters of holiness is the opening through which the evil inclination can enter and lure a Jew to sin.
So it was after the Exodus from Egypt, when the Children of Israel questioned: “Is G-d among us or not?”
When such doubt arose – whether indeed G-d exercises special providence over Israel, or whether a Jew is subject to the forces of nature – this was the breach that enabled Amalek’s intrusion.
A Jew must apply the same “weights” and “measures” he uses in bodily and material affairs to matters of the soul. He must remember that the Torah is “our life”, and just as he ensures that his physical life is whole and prosperous, so must he care for the life of his soul, with consistency and inner vitality.
When he truly lives in Torah and mitzvot, Amalek will not be able to approach him, and he will be spiritually healthy.
(from the teachings of the Rebbe, Torat Menachem, vol. 33, p. 187)
