Caruso - The vocal artist must remember that he does not sing with his throat but through it.

There can be no beautiful singing without a perfect tone attack.  If the tone is not issued with sureness and decision,

it will be ragged and breathy, with a tendency to leave the pitch.

A calm mind facilitates the task of completely relaxing the vocal organs.

This is from the book - Caruso and the Art of Singing by Salvatore Fucito and Barnet Julius Beyer