Nichiren’s argument for the need to use the way of subduing is developed further in the True Way of Practicing the Teaching of the Buddha (Nyosetsu Shugyō-shō).
“All those who want to practice Buddhism should know that there are two ways of propagation, embracing and subduing. All Buddhist scriptures, sūtras and commentaries must be propagated through these two ways. However, scholars in Japan today, though they seem to have learned Buddhism in general, do not know how to meet the needs of the time. The four seasons differ from one another. It is warm in summer and cold in winter, flowers bloom in spring and trees bear fruit and nuts in autumn. How can we harvest crops in spring by planting seeds in the fall? Heavy clothes are for the cold winter, not the hot summer. A cool breeze is needed in the summer and not in the winter.
“The same could be said of Buddhism. There are times when Hinayāna teachings can be spread effectively, and times when provisional Mahāyāna teachings might be more effective. Still other times might call for the True Dharma to be disseminated for the attainment of buddhahood. The two thousand year period following the death of Śākyamuni Buddha, namely the Ages of the True Dharma and Semblance Dharma, is the time for the Hinayāna and provisional Mahāyāna teachings to be spread. The five hundred year period at the beginning of the Latter Age of the Dharma is the time exclusively for the pure, perfect, only real teaching of the Lotus Sūtra to be disseminated. This is the time when quarrels and disputes are rampant, the True Dharma is hidden and the difference between the true and provisional teachings is blurred. It is said in the Nirvāṇa Sūtra: ‘Arm yourself with swords, staves, and bow and arrows when there are enemies of the True Dharma; it is no use having them when there are no enemies.’ Provisional teachings today are enemies of the True Dharma. If provisional teachings stand in your way as you try to spread the One Vehicle teaching of the Lotus Sūtra, you should thoroughly refute them. Of the two ways of propagation, this is the way of subduing of the Lotus Sūtra. Great Master Tiantai declares in his Profound Meaning of the Lotus Sūtra, fascicle nine: ‘The Lotus Sūtra is the teaching of subduing, the denouncing of the provisional teachings. ‘ How true this is!
Open Your Eyes, p570-571