and then
"Real speed and strength comes from complete relaxation and not tension, which weight lifting only promotes."
May we assume, then, that now that you don't lift weights, you can squat and bench more? No? Maybe it isn't a good idea to use "strength" to mean something other than what everyone else means by it.
The strength I am referring is the strength of the "climb a mountain" type or the "move from point A to point B in the most economical way" kind or the "take on an adversary much stronger than myself" kind.
On the speed side, for example, weightlifting, as it is popularly promoted, slows down the body. The biceps and the triceps work against each other and unless you can properly relax the countering muscle your intentions will be dampened. Weightlifting generally promotes tension in all muscles, thus a general slowing down.
/end sarcasm.
You were previously talking about "strength" rather than "health". At least, you used the word "strength," so I assumed that was what you meant. If you meant to be talking about general health, then that's very different, and I don't have much to say on it. :)
Your biceps and triceps must work against each other or you will have no control over what you're doing.
Sounds like you've fallen under the influence of quacks.