Buddhism is found in the reality of society and daily life. Because Buddhism is in no way separate from this reality, we must strive through our actions to be exemplary models for others.
Life may be more akin to a series of meets than a single marathon. You can lose a race here or there, as long as you win in one contest, in one area. All the struggles you endured will become a prized investment in your own person.
Faith is perseverance. The key to victory in any struggle in life is persistence. That is why Nichiren stresses the importance of having faith that flows ceaselessly like water rather than faith that flares up briefly like fire. To advance continuously, it is important never to become exhausted. Carrying out activities until late at night does not equate with strong faith.