A kind word and a mean word do not weigh the same, word for word.
Kind words are light and porous–beautiful–and only make a solid structure with many upon many upon many. The weight multiples as the words do and stronger becomes the structure.
Sadly, it only takes one badly-placed mean word–hard and dense–to destroy a whole series of kindnesses. Repair and healing take time,
and often a scar remains.
Take care how you build.