Proverbs25:13 As the cold of snow in the time of harvest, so is a faithful messenger to them that send him: for he refresheth the soul of his masters.
14 Whoso boasteth himself of a false gift is like clouds and wind without rain.
In Judea it would snow a lot and the people would dig snow houses to have snow for summer use, this was refreshing.
Likewise a person who brings good tidings to hose that are in charge lifts them up and refreshes there belief in God’s blessing. On the other hand those that say they are going to do one thing and don’t is very disappointing just like when you really need it rain and big dark clouds appear and it never rains. Let us strive to be the bearer of good news and not false promises.