Are people with a high intelligence born or raised? Or both?

[Grendel]

So using your abilities (tactics) without a plan (strategy) is bad? And having a plan (strategy) without ability (tactics) is the slowest route to victory?

Assuming tactics mean disposing armed forces as in doing the work, an action, and strategy is planning and directing the operations of the military, as in having a goal and a vision and a solid plan.

I assume you meant the quote "Strategy without tactics is the slowest route to victory. Tactics without strategy is the noise before defeat. — Sun Tzu".

However this could also just be my bad interpretation of what others say as usual...

No, it's that the macroscopic supercedes the microscopic.

Choices you make along the way are small and circumstantial, but your max potential pervades every moment, and is thus of ultimately more import.