Full Idea
The principle of sufficient reason is the ground of possible experience, namely the objective cognition of appearances with regard to their relation in the successive series of time.
Gist of Idea
The principle of sufficient reason is the ground of possible experience in time
Source
Immanuel Kant (Critique of Pure Reason [1781], B246/A201)
Book Reference
Kant,Immanuel: 'Critique of Pure Reason', ed/tr. Guyer,P /Wood,A W [CUO 1998], p.311
A Reaction
The argument to this claim from the necessity of succession in time looks unconvincing to me, but the principle of sufficient reason is deeply imbedded in the human mind. However, philosophers seem to feel it more strongly than other people.