I have a tendency to try to handle life on my own.  I guess I've always just reasoned that I'm capable of handling whatever situations come my way, and I'd like to think that I do it pretty well at times.  The key words of the last statement are "at times."  Unfortunately, there are a lot of times when I fail.  I might think I know what I'm doing at a particular time, but it often turns out that I really had no clue.  I think that's why Peter tells his readers to humble themselves under the mighty hand of God and to cast all of their anxieties on Him.  See, when we humble ourselves we stop thinking that we know everything – we actually admit that we need help.  At that time we stop trusting ourselves and our own strength and start trusting in our heavenly Father and His strength.  It's interesting to me that just after saying this Peter says that our enemy the devil is prowling around like a roaring lion seeking someone to devour.  Could it be that one of the ways the devil nabs people is by getting them to rely on themselves – an action that, when fully examined, asserts the belief that they are god?  Cast your cares on God, and don't try to handle them by your own strength.  Humble yourself, realizing that He knows what's best.  And in the end, you will resist the devil.