The person who looks to the future and keeps moving ahead is eternally youthful

Time is constantly passing, one moment following fast upon the other. That's why it's so important to press forward boldly, without complaining or fretting. The person who looks to the future and keeps moving ahead is eternally youthful. Such a person's heart is filled with flowers and shines brilliantly.

Wisdom for Modern Life by Daisaku Ikeda 1/10

The Teaching, Capacity, Time, and Country

If even Shariputra, the foremost in wisdom among the disciples of the Buddha, failed to understand people's capacity, then how much more difficult must it be for ordinary teachers today, in the Latter Day of the Law, to have such an understanding! Ordinary teachers who lack an understanding of people's capacity should teach only the Lotus Sutra to those who are under their instruction. 10/2

The Writings of Nichiren Daishonin
The Teaching, Capacity, Time, and Country
Recipient unknown; written on February 10, 1262