Jai Sri Ganesha,
Substance of doubt which follow the aspirant as shadow is first cause to reach at the concluding phase of truth,
Material cause is secondary in line, first is independent truth that hard to track with,
Material cause multiply in self on the sphere of self evolution which further add doubt to spirit in quest for self,
Ancient sages may have trail the truth of first cause but crossover it with silent verdict which left the cavity behind to fill with experience,
May Lord bless all,
Thanks please