Two ways to live

There are two ways people live, either acting without  really knowing the consequences of their actions which often may be irrevocable and damaging or waiting for clarity to emerge before acting. Then the question arises, how will one ever know the complete consequences of an action in time, time being an infinite continuity and man's life being short. I have seen people act with the noblest of inentions and lament over the unforseen effects,of things gone completely wrong. The next obvious question is is there an action out of the realm of time which can never be wrong. It may be complete inactivity if the situation demands so but never detrimental. And is that action in anyway influenced by thought and knowledge or a spontaneous response of  intelligence?Thought and knowledge being limited at a given moment are never complete enough to know the cascading effects of any act. So the action must be a spontaneous unconditioned response of intelligence. But thought being the trickster that it is can deceive oneself and invent this spontaniety which is even worse than a deliberate act. So how does one become sure of this complete detachment of memory,thought and knowledge which brings with it great clarity into the act. These are of course not physical actions which are affected by time and space conditions and therefore need a response in thay realm but mental decisions and answers to existential questions. Something as significant as what should i do with my life and for how long given the resources and faculties i have , irrespective of how limited or extraordinary they are.
Accepting a ready made answer wont help because unless their is a comprehen understanding of the question why, the motivation and drive to act will fizzle out. And untill one understands what and why it might best be to do insignificant things very intensely  and diligently so that the damage is restricted.