There are three kinds of actions that cause harm to ourselves, two in this world and one in the next world.
When a person curses himself, the angel appointed to him and the seventy others under him answer Amen. The words are taken up, judged and the angel fulfills the curse.
The Zohar gives the example of Moses who ‘threatened’ God to follow his advice or remove him from the ‘book’. Even though God followed his advice, Moses got his ‘judgment’ and was removed from the portion of ואתה תצוה ‘Tezaveh’.
“אָמַרְתִּי– אֶשְׁמְרָה דְרָכַי, מֵחֲטוֹא בִלְשׁוֹנִי:
אֶשְׁמְרָה לְפִי מַחְסוֹם– בְּעֹד רָשָׁע לְנֶגְדִּי”
“I said: ‘I will take heed to my ways, that I sin not with my tongue;
I will keep a curb upon my mouth, while the wicked is before me.”
King David knew the power of words and watched every word that came out of his mouth. He was aware about ‘the wicked’, who is the angel that has the power to fulfill his negative words.
The lesson is simple. Do not utter any negative words especially curses because they will stick to you until they are fulfilled. The ‘cure’ is to bless and build everyone on your ways. Support and encourage everyone and the energy that you produce will come back to you.
“שַׁלַּח לַחְמְךָ, עַל-פְּנֵי הַמָּיִם: כִּי-בְרֹב הַיָּמִים, תִּמְצָאֶנּוּ”
“Cast thy bread upon the waters, for thou shalt find it after many days.”
Everything we do comes back to us, sooner or later. Watch your mouth and be blessed.