I believe that the ability to contradict oneself is a sign of understanding, or in some cases proof that it is a original thought.
Be frugal, But also learn when not be frugal.
Learn to push past your limits; also learn when to give up.
Learn to hold on; Learn to let go.
Learn to hustle; also learn to enjoy.
But how to know which path to take when?
The answer is in the context. Every advice is not an independent thing that makes sense on its own. An advice is always dependent on the context, the person to whom it is provided, their physical health, the social and economical conditions of the world at large. And is large is dependent on the person giving the advice and what they understand about the situation to which they are giving you the advice.
Every habit, every advice, every trick, evert tip everything is all dependent on the context at which it is to be applied.
What is context?
The context is the time, the person, the reasons, the urgency, the importance, or precisely the relative importance.
In your 20s Hustling is a better idea than it is in your 40s.
Does that mean some one should always choose to hustle in their 20s? No, that is certainly not. It depends on the other things like what you choose to work on, your health.