Lyric discussion by AmericanCoil 

Cover art for Cold lyrics by Lacuna Coil

In the verses, it sounds like a loved one is dying, and the speaker is just putting on a strong facade and numbing the pain. In the B section, they describe the futility of resisting death(or resisting something-what is 'desire that you cannot mention?') But then again, in the C section, they still insist on defying the odds. Not just to live, but to thrive. To reach for the sky and to fly.

Maybe it's not necessarily about a literal death, but a difference of direction that pulls two people in opposite directions, although one of them wants to keep the other with them, instead of letting them go.