Victoria Osteen shouldn't be quoted about anything. Unless it's the fact that she has a private jet funded by their "ministry".

It's reasonable to think that any sin can hinder our prayers but the Bible only mentions this:

(1 Peter 3:7 NIV) Husbands, in the same way be considerate as you live with your wives, and treat them with respect as the weaker partner and as heirs with you of the gracious gift of life, so that nothing will hinder your prayers.