If you have to attain Buddhahood….

Nichiren Daishonin

Now, if you wish to attain Buddhahood, you have only to lower the banner of your arrogance, cast aside the staff of your anger, and devote yourself exclusively to the one vehicle of the Lotus Sutra. Worldly fame and profit are mere baubles of your present existence, and arrogance and prejudice are ties that will fetter you in the next one.

From Wikipedia:

Nichiren (日蓮; 16 February 1222 – 13 October 1282), born as Zennichimaro (善日麿), was a Japanese Buddhist priest who lived during the Kamakura period (1185–1333). Nichiren is known for his sole devotion to the Lotus Sutra, asserting that it was Shakyamuni Buddha‘s ultimate teachings and was the exclusive method to attain enlightenment. Nichiren believed that the Lotus Sutra contained the essence of all of Shakyamuni Buddha’s teachings related to the laws of causality, karma, without any distinction to enlightenment.His interpretation of the Lotus Sutra centers on the emphasis of its 16th chapter, The Life Span of the Thus Come One, where he grounds his revelation that the chanting of Nam Myōhō Renge Kyō is the superior practice of today’s age (Mappō).

Read Nichiren’s Writings here