He who is fixed to a star does not change his mind.

A fixed point above you makes course changes survivable, because you can alter the route without losing the direction. People who look admirably consistent are often not stubborn about methods at all; they are anchored to something further away than the current plan. Without that anchor, every setback becomes a referendum on the whole enterprise.

Work out what your fixed point actually is, in one sentence, and keep it separate from the plan you are currently using to reach it. Then, when something fails, you will know whether you are changing route or abandoning destination. Confusing those two is what makes people quit things they still want.