Justin has told that someone once shared with him the wise words: "a successful journey always starts with a first step". Who was it?

Explanation

Since Usher and Justin started collaborating in 2008, Usher has played a large role in Justin's life. "When Usher talks to you he does so in a low voice. He is very intense and looks into your eyes. When Usher says something, people listen", says Justin. Justin has received many words of wisdom from Usher, including: "a successful journey always starts with a first step".