Living by principle vs vision

To give an example:

In principle: "A 1000 mile journey starts with the first step and then the next and the next..."

But a person thinking from the vision point of view will be like: "A 1000 mile journey will take you forever, it would take you 100s of days, and you'd have to deal with these terrains, climates, nights to be spent in these places etc." 

So the principle based person would say: "So what! just take each step and work out the problems as they come by, anyway this is the thing to do."

The vision person would be wondering: "Should I even attempt this journey at all, is there another way etc."

He would be trying to work out all the complexities, planning etc. while flipflopping in his decision to even travel or not.

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I've seen people who live by principles do not get depressed.

Depression seems to belong to the vision based person.

Like in principle, there are 7.5B people on earth, and I have interacted with at most 1000 of them, and even among that the people at the moment most influencing me is less than 10.

So in principle, there are infinite possibilities for relationship.

But in vision one sees the actual realities, and how hard it is to really seek such a thing.