Add ten consonants [orange] to form five 4-letter words vertically of the structure CVVC.
When some vowels are added appropriately [yellow], the orange and yellow cells, when read in a left to right manner form a sentence which has some relevance to the title. Such vowels precede the consonants to which they are vertically paired in the table. Of those vowels only one is duplicated.
In the first table all letters are valued A-Z from 1 to 26. In the second table the vowels have ascending values from 1 to 5.
The green cells represent the column sums of values of all absent letters.
What is the sentence?
On reading cell order of sentence. If the first two vowels occur in the second and fourth yellow cells the sentence would begin CVCCVC.