The ability to say No is a power but it also indicates an inability to trust easily. It is almost like seeing the problematic or difficult side of everything. What needs to be done is to step back and stay inwardly quiet and then feel the answer in the depths of your heart. Then go ahead with that decision offering it and the consequences to God. As an interim measure you can always tell the person that you would like to give it a thought and revert in a while. Rushing to say Yes is often worse than rushing to say No. An impulsive Yes is often a rash overconfidence whereas an impulsive No is sign of caution. The mind cannot decide in such a case because it doesn’t have the key to the future. But the heart has an intuitive access to the future and the right thing to do provided you step back and quieten the mind. Try tuning in to the inmost heart and say Yes or No from there.
Affectionately,
Alok Da