Lyric discussion by iordseyton 

Cover art for Amphetamine Logic lyrics by Sisters of Mercy, The

falling over = either dieing or compromising their beliefs standing still= going nowhere, either mentally or in the world

I think that the "knife" is logic, as an occam's razor-like way of seeing the world, (as an amphetamine prescribe logic major, this is more or less the story of my existence)

so "nothing but the knife to live for" is kind of a logical version of live by the sword, die by the sword

"One life is all i need" then is quite literally, i understand this world well enought that i dont feel the need to live another one. "give me one good reason" (to live?)- like the above, if you see the world for what it is, and its essentially meaningless, what reason do you have for living (or wishing to live (again))
-alternatively, "one good reason," might be logic, or, in the thinly veiled metaphor of the song, More Speed!

I'm going to skip the second verse, Its pretty much a reiteration of eldritche's analysis of love, like his "life is short and love is always over in the morning" from temple of love

"hit up steel in hand" working away with the compulsion of amphetamines. im not sure what exactly is meant by steal in hand, but i picture something along the lines of a blacksmith pounding away at the anvil.

"lit up, like candles" first off, 'lit up' is old school slang for sped out of ones head. lit up like a candle is a popular phrase these days for often used to mean 'high off your ass' This refers to the fervor of the speed, the veritable brink of madness as it were.

Hit up = taking a shot of drugs Steel in hand = a hypodermic needle Lit up like candles = high

Give me one good reason, give me more s(peed)