The only curse that will come to pass is the curse of God. If a curse is not aligned with his will it will fail.
Let not Christians be fearful timid people, always worrying about the outcome of this or that. Some people’s minds are like this, always jumping from one thing to another. It may be a sign of prayerlessness and lack of trust. We are supposed to be those who trust God, not those who are constantly worrying about the harm that puny human beings are going to do us. Sometimes it is a sign of wrong priorities, where we think too much of earthly circumstances instead of spiritual things. Worry can also be a form of self-pity, in which I put myself at the centre of my life.