A famous English proverb was coded by me twice: the 1st line consists of 26 letters of the English ABC each being replaced by C for the consonants and by V for the vowels (word=CVCC) while the letters in the second line provide letter C for each of composite numbers in the list corresponding to the value of serial place of the letter and P if the number is prime. (word=>23,15,18,4=PCCC)

1st line:
CCVCCVCV CVCC CVC VVV CVCCVCV

2nd line:
CCACCPCC PCCC PPC CCC CCPCPCP

Rem1: Y is counted as a vowel
Rem2: A=1 is neither prime nor composite number so it stays A in the second line and V in the first

What is the original proverb?