By Nolan Feeney
April 24, 2015

One of the biggest questions surrounding Bruce Jenner’s rumored gender transition is how it might affect his relationship with his family. “Those are the only ones I’m concerned with,” the Keeping Up With the Kardashians star says in a promo for his sit-down interview with ABC’s Diane Sawyer, which is expected to address months of speculation about Jenner’s personal life when it airs Friday night. “I can’t let myself hurt them.”

In a 2013 Father’s Day letter published on TIME, Jenner advised his children—namely daughters Kendall and Kylie—to embrace change, no matter what form it takes. “That’s the thing I’ve learned to value most: be true to yourself, be your own person,” Jenner wrote. “Trying things outside of your comfort zone is essential, because your ability to grow as a person is directly related to the amount of insecurity you can handle. So be strong and fearless on this journey we call life.”

Read Jenner’s complete letter, below:

Write to Nolan Feeney at nolan.feeney@time.com.

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