You set a goal. You go after it. No matter what.
No matter what?
What if what it takes defeats your purpose.
Worse: what if what it takes corrodes you.
When I was in high school, one of our teachers told us something that has stuck with me: if you want to go straight, a sure way to get lost is to set one foot after the other. It creates the illusion of you walking on a straight line but walking like that will lead you astray. She said: the only way to go straight is to look where you want to go, your steps will follow.
If it is not you leading the way but you do care about where you are going, always ask: are we setting one foot after the other or are we indeed headed towards where we want to go? Also ask: do we have the same destination in mind?
And here is a tip about choosing destinations: factor in the consequences of you getting there on Others. It is not about morality. It is about rationality. You are not an island.