To choose is intrinsically difficult - in order to choose wisely, you have to know the options quite well; but you cannot know either option well enough from a distance, you must come close to each one of them; but in coming close, this action of yours already resembles the choosing of either one.

In reflection/concept/rational thinking, you think you're tackling the choice quite objectively, you think you have a chance to do so; in existing/practical living/faithful second immediacy, you are partly drawn by the current of time to move forward into the choice, partly moving into it yourself.

To choose is difficult, challenging, and upbuilding. Perhaps this is why Kierkegaard makes so much of "choosing" in his first major work, Either / Or.

But, to choose or to wait, to take action or to observe some more, to come close or to stay aloof, are they dichotomous choices? Perhaps the two ends can be held together? 

So, tension cannot be avoided altogether while we exist. But each must fulfill his role, and act on time, and to wait obediently, if need be.