While diluting an acid, why is it recommended that the acid should be added to water and not water to the acid ?

Explanation

1) The dissolving an acid or base in water is an highly exothermic process. Care must be taken while mixing concentrated. `HNO_3` or concentrated `H_2SO_4` with water.
2) The acid must always be added slowly to water with constant stining.
3) If water is added to a concentrated acid, the heat generated may cause the mixture to splash out and cause bums.
4) The glass container may also break due to excessive local heating.