Here we go straight from the Lotus Sutra; I've used this online translation for convenience, for personal use I use the Senchu Murano translation from Nichiren Shu.
I forthrightly abandon expedience and only preach the Supreme Way.” (“Chapter of Expedience” 2 (T.9.10a))http://www.buddhistdoor.com/oldweb/reso ... lotus2.htm
Lotus Sutra Chapter 3 " A Parable"
If there be those who, with mind intent,
Seek the Buddha.s Sharira,
Or who likewise seek the Sutras,
And attaining them hold them atop their crowns,
Such people will never again
Resolve to seek other Sutras
Nor ever have the thought
To seek the writings of outside ways,
For people such as these,
You may speak it.http://www.buddhistdoor.com/oldweb/reso ... lotus3.htm
“Chapter of the Parable” (T.9.16a), “Only rejoicing to receive and keep the Great Vehicle Sutra Canon, not even receiving one verse of other Sutras”;http://www.buddhistdoor.com/oldweb/reso ... lotus3.htm
In Chapter 15 "Welling from the Earth" The Bodhisattvas-Mahasattvas from other worlds wish to proclaim the Lotus Sutra but the Buddha Shakyamuni replies
it is the duty of the Bodhisattvas from under the earth.
" Stop! Good men, you do not need to protect and maintain this Sutra. Why not? Within my Saha World itself there are Bodhisattvas Mahasattvas equal in number to the sands of sixty thousand Ganges Rivers, each of whom has a retinue equal in number to the sands of sixty thousand Ganges Rivers. After my quiescence, all of them will protect, uphold, read, recite, and vastly proclaim this Sutra."http://www.buddhistdoor.com/oldweb/reso ... otus15.htm
And in Chapter 22 'The Trasmission" / "The Entrustment" The Buddha Shakyamuni tells the Bodhisattvas from Under the Earth to transmit this Dharma widley:
I have cultivated and practiced the rare Dharmas of anuttarasamyaksambodhi I now entrust them to all of you. You should receive, uphold, read, recite, and vastly proclaim this Dharma, causing all living beings to hear and understand it.
"In the future, if there is a good man or a good woman who believes in the Thus Come One's wisdom, you should expound the Dharma Flower Sutra to that person, causing the person to hear and understand and obtain the Buddha's wisdom.http://www.buddhistdoor.com/oldweb/reso ... otus22.htm
So as you see these aren't my words or opinions they come straight from the sutra.