Discussing the principles of notion and acknowledgement in sciences is
one of the characteristics of Philosophy in its specific sense. This is fully
emphasized since the age of Avicenna. For this very same reason philosophy
is recognised as the base of all sciences. The present article is an attempt to
explain the viewpoints of Avicenna and Mulla Sadra, as well as matters like
nature,subject of natural sciences, quality of superimposition of natural body,
temperament and its relation to the question of matter and form
)