Words plant seeds.
They are themselves seeds that, when rightly spoken, germinate life in the hearers. There is more than one way to conceive life. Seeds can nourish the body, but they themselves can propagate life. Similarly, words can nourish the heart and soul and propagate life. Words of encouragement or knowledge, even stories can nourish the reader or the hearer.
At the same time, careless or thoughtless words; degrading or insulting words, carry death. There is a plant that I saw growing alongside the road in Ethiopia. It looked fruitful, but I was told they were toxic–poisonous.
Words are seeds of the heart that can plant life or death.