Is it permissible to say, “By Allah, I shall certainly discipline you, O nafs”?
Question

                I have come up with a campaign called “By Allah, I shall certainly discipline you, O nafs”. This is a campaign that promotes self-development and jihad an-nafs. I am going to set up programs for purifying the soul, softening the heart and reminding one of death, and I want to post lectures by trustworthy shaykhs.

 Is there anything wrong with saying I shall certainly discipline the nafs that was created by Allah?

 Does the fact that this title contains an oath mean that other members are compelled to join the campaign? Please note that I said that whoever posts a comment on this topic will be regarded as having joined us in this campaign.
Praise be to Allah.There is nothing
wrong with a person saying to himself, “I shall certainly discipline you, O
nafs” if he is disciplining himself in accordance with the teachings of Islam.
Even though Allah created the nafs, the main purpose for which Allah has
prescribed religion is to discipline the nafs, purify it, and instruct it to do
acts of worship and obedience. To Allah belong the creation and the
commandment.
Imam al-Aajurri
(may Allah have mercy on him) said: 
If someone were
to say: what evidence is there for disciplining the nafs? The answer is: The
Qur’aan, the Sunnah and the words of the Muslim scholars. End quote from Adab
an-Nufoos, p. 9
He also said (p.
17):
How bad is the
situation of the one who neglects to discipline his nafs and train it on the
basis of knowledge; and how good is the situation of the one who pays attention
to disciplining his nafs and knows what Allah has enjoined upon him and what He
has forbidden to him, and is patient in going against the whims and desires of
his nafs, and seeks the help of Allah the Almighty in doing so. End quote.
And he narrated
in his book (p. 13) that ar-Rabee‘ ibn Anas said, concerning the verse “Ward
off from yourselves and your families a Fire (Hell)” [at-Tahreem 66:6]:
Discipline and train yourselves and your families to adhere to the commands of
Allah, may He be glorified and exalted.
And he narrated
(p. 14) that Sa‘eed ibn Jubayr said: that is: proper etiquette and manners.
Then he (may
Allah have mercy on him) said (p. 15): Do you not see, may Allah have mercy on
you, that your Lord Most Generous is urging you to discipline yourself and your
families. Pay heed to Allah and make yourselves adhere to that. End quote.
Based on that:
there is nothing wrong with the phrase mentioned and there is nothing wrong
with giving the group the title mentioned, even if this phrase was not narrated
in this way from some of the Salaf, so long as it is Islamically acceptable in
and of itself and does not include anything that is not appropriate according
to Islam.
If you choose a
title that is similar in meaning, such as “Self-discipline” or “Training the
nafs” and so on, that is also good. Such words were used as book titles by some
of the Salaf.
The oath
mentioned is not regarded as compelling anyone to join the group; rather he is
a member if he accepts the conditions stipulated in the group.
And Allah knows
best.