Signor Bonci of the Metropolitan Opera Company says that the secret of good voice is relaxation; and this is true, for relaxation is the basis of ease. The air waves that produce voice result in a different kind of tone when striking against relaxed muscles than when striking constricted muscles. Try this for yourself. Contract the muscles of your face and throat as you do in hate, and flame out "I hate you!" Now relaxas you do when thinking gentle, tender thoughts, and say, "I love you." How different the voice sounds.
In practising voice exercises, and in speaking, never force your tones. Ease must be your watchword. The voice is a delicate instrument, and you must not handle it with hammer and tongs. Don't _make_ your voice go--_let_ it go. Don't work. Let the yoke of speech be easy and its burden light.