The past is only the guide to future if we live in the past and project into the future based on past experience.
If we silence our mind and just observe it, without energising our thoughts, then thoughts subside and we can be present in this moment. This allows us to focus on just what we are doing now, and nothing else.
From within our essence will flow what we need to do in any given moment, and thus will not be sabotaged by the thoughts of what may have occurred before, which have no relevance to now. What happened before no longer exists and cannot, therefore, affect any outcome now, unless we allow it to.
Equally, if we focus on the outcome and not the doing now, then our projections into the future of the likely outcome of our doing lead to the mind sabotaging. Again, the future is not real and does not exist.
If we stop basing our current real-life action now, this exact moment, on the fantasy of the future, and the non-existent past, then all we do now will be as we choose and manifest it to be, now. It will come from within our soul and being, free from negative sabotaging thought.
The only outcome that matters is what actually happens now, as now is the only reality that ever exists and ever will. We can not do in the past or the future, only now.