If this happens, it's best to soften it back into a liquid before adding it to the rest of the recipe. This is easily and quickly done by setting the bowl with the gelatin in a small saucepan filled with an inch of water over medium-high heat.
I am the vine, ye are the branches: He that abideth in me, and I in him, the same bringeth forth much fruit: for without me ye can do nothing.
(Joh 15:5)