Why not be alert, keen, energetic, enthusiastic, ambitious, bubbling over with fiery ardor?

What she said she meant with all of the fiery ardor of her being.

It was Captain Conwell's speeches that had stirred the boy and moved him with such fiery ardor to go to war.

And in the fiery ardor of their enthusiasm, hard concrete facts were dissolved and set floating as illusions in the ambient mist.

The magic promise, "Beatrix shall love you," made by Camille, was the talisman with which he strove to restrain the fiery ardor of his passion.