Haven't we all been guilty of this!
From The Message
Nothing But a Wisp of Fog
And now I have a word for you who brashly announce. "Today--at the latest, tomorrow--we're off to such and such a city for the year. We're going to start a new business and make a lot of money." You don't know the first thing about tomorrow. You're nothing but a wisp of fog, catching a brief bit of sun before disappearing. Instead, make it a habit of to say, "If the Master wills it and we're still alive, we'll do this or that."
As it is, you are full of grandiose selves. All such vaunting self-importance is evil. In, fact, if you know the right thing to do and don't do it, that, for you, is evil.