To have faith is the basis of Buddhism

Make every possible effort for the sake of your next life. What is most important is that, by chanting Nam-myoho-renge-kyo alone, you can attain Buddhahood. It will no doubt depend on the strength of your faith. To have faith is the basis of Buddhism. 14/10

The Writings of Nichiren Daishonin
The Real Aspect of the Gohonzon
Written to Nichinyo on August 23, 1277