CC Ādi 16.86

vicāri’ kavitva kaile haya sunirmala
sālaṅkāra haile artha kare jhalamala
Word for word: 
vicāri’ — with proper consideration; kavitva — poetic explanation; kaile — if done; haya — it becomes; sunirmala — very pure; sa-alaṅkāra — with metaphorical use of words; haile — if it is; artha — meaning; kare — does; jhalamala — dazzle.
Translation: 
“Poetic skill used with due consideration is very pure, and with metaphors and analogies it is dazzling.”