Musar על עירובין 107:7

The reason is obvious: Speech is not a specific part of a man as his other limbs are, each one being of benefit in itself. But it is the generality of man and his completeness. And that is why, when he perfects himself by occupying himself with Torah, all of his limbs are amended. For it reposes upon them a spirit of holiness to vivify them and to sustain them in this world and the next. As Chazal have said: "If one's head ails him, let him study Torah, as it is written, etc. If his throat ails him, let him study Torah, etc. If his whole body ails him, let him study Torah, as it is written (Mishlei 4:22): 'And to all his flesh it is healing.'" And the opposite, G-d forbid — by forbidden speech, he harms and defiles all of his limbs, and each and every limb falls from its eminence through this. And what advantage is it to them that their master lives and speaks if only to render din and accounting!

CLINGING: The matter of clinging is when a person's heart clings so much to the blessed G-d that he ceases to turn or take interest in anything else but Him. This is what Shlomo brought by way of analogy: "a lovely hind and a graceful doe, her breasts will satisfy you at all times; you shall always be infatuated with her love" (Mishlei 5:19). And in the Talmud, our sages, of blessed memory stated (Eruvin 54b): "It was said of Rebbi Eliezar ben Pedat that he sat and studied Torah in the lower market of Tzipori while his cloak lay in the upper market of the town". The ultimate goal of this trait is for a person to cling thus to His Creator at all times, and at every moment. But at the least, if he loves his Creator, certainly he will cling to Him in this manner during the times of his [divine] service.