A spark neglected makes a mighty fire. Herrick.Hesperides, Aphorisms, No. 152. Shakespeare.King Henry VI., Part III. Act IV. Scene 8. (Clifford to Warwick.)
And where two raging fires meet together, They do consume the thing that feeds their fury. Shakespeare.Taming of the Shrew, Act II. Scene 1. (Petruchio to his Father-in-law.)