"It is temptation which harasses you and nothing but empty fears which terrify. What does anxiety about the future bring you, except sadness upon sadness. Sufficient to the day is its own evil (Mt. 6:34). It is a vain and useless thing to be disturbed or pleased about future things, which may never come to pass.

But it is typical of a man to be deceived by such imaginations, and it is the mark of a mind that is still weak, when it allows itself to be so easily drawn to the suggestions of the enemy. For he does not care whether it be by things true or false that he deceives and abuses you, or whether he overthrows you with a love for earthly things or by a fear of things to come. 'Let not your heart be troubled, nor let it be afraid' (Jn. 14:27)." - True Devotion: Consecration to Mary - St. Louis de Montfort