Song writing is a mysterious art and I tend not to analyse it too much. For me, I have to put my mind to it, make the time to be with my instruments and enjoy them. Something will come out of that joy. Often I start by just playing for pleasure then listen for a phrase, or a line of music to move me. It's often a long process and sometimes can take months for something to resolve itself into the right piece of music that works as a piece that I 'feel' from beginning to end. It's joyous hard work! The lyrics have to come 'from the heart' - that's all I know about that. I have to mean it - and it has to mean something to me.