I think the best lyrics come fast. Its kind of like you are just the vehicle and the words are flowing thru you and you're just writing them down to document the moment. Songs that i have written like that are my best work and pass my 12 month test (after a year i still don't think they suck).
The more you contrive lyrics, the more contrived they sound. When you are contriving lyrics, and you get to the point of going thru every letter in the alphebet to get a rhyme...
(example: And, Band, Comand, Dand, Eand, Fan, Grand, Hand...ect..ect)
forget it...at that point you are in the process of writing lyrics that will not hold up cause they are uninspired. I have done this myself and without fail im working on something thats just not happening at that point.
I can relate to jamal, I use to be in top level management and had very little time to write. It is CRUCIAL to be able to follow thru on an idea when the inspiration hits. Now im an idependant contractor for a health insurance company and i drive alot. I turn off the radio and kind of meditate on the open road and get alot of ideas...and if i get inspired i can just pull over to the side of the road and write down the words.
Everyone is different, but for me, I can't force a song. I will say this though, when im focused on writing a song, im more tuned in to the things going on around me and more likely to be inspired.