Flare of Fortitude

Effects that replace an event with having you gain life (like Words of Worship's effect does) or having you lose life will end up replacing the event with nothing.

Effects that would replace having you gain life with some other event won't be able to be applied because it's impossible for you to gain life.

If a cost would include causing you to gain life, that cost can't be paid. Similarly, you can't pay a cost that includes the payment of any amount of life other than 0 life. However, you can choose to be dealt damage, even though that damage won't result in your life total changing.

If an effect would cause you to exchange life totals with another player, the exchange won't happen. Neither player's life total changes.

Abilities that trigger whenever damage is dealt to you will still trigger because that damage is still dealt, even though your life total doesn't change as a result.