The information you consume each day is the soil from which your future thoughts grow. - James Clear

Something I heard recently and I've tried to adopt whenever possible:

“Whoever has the most fun, wins.”

Your identity can hold you back:

-I'm terrible with directions.
-I have a sweet tooth.
-I'm bad at math.

…or build you up:

-I'm the type of person who doesn't miss workouts.
-I finish what I start.
-I read every day.

Build habits that reinforce your desired identity.

Be forgiving with your past self.
Be strict with your present self.
Be flexible with your future self.