firmness

noun4

1. •
   The state of being firm
2. •
   security; steadfastness; good grip
3. •
   physical durability; rigidness (of material)
4. •
   strictness; mental strength

   • But many a man who would have stood within a home dismantled, strong in his passion and design of vengeance, has had the firmness of his nature conquered by the razing of an air–built castle. — 1842