Undiluted Gospel

Romans 1:16 states that the gospel of Christ is the power of God unto salvation for everyone who believes. This implies that there is something about the message that when preached, the Spirit of God moves and has an affect on those who believe. People are set free and sin, sickness, and all other effects of the curse are destroyed. When Philip preached the gospel in Samaria "the multitudes with one accord heeded the things spoken by Philip, hearing and seeing the miracles which he did. For unclean spirits, crying with a loud voice, came out of many who were possessed; and many who were paralyzed and lame were healed. And there was great joy in the city"(Acts 8:5-8). So one must ask, if we are preaching the gospel today, where is the power accompanying our preaching and our lives as Christians? Obviously God hasn't changed and the power in the gospel isn't diminished, so the problem must lie with us, our message, and our approach to it.
The gospel (God the father's sacrifice of his own son in our place, reconciling us to himself, not only bringing us forgiveness by exchanging our sin and guilt for Christ's righteousness, but making us a new creation, calling us his beloved children, indwelling us with his spirit and giving us the Kingdom as an inheritance.) is a gospel of grace received strictly by faith and independent of our efforts(works of the Law). "For by grace you have been saved through faith, and that not of yourselves; it is the gift of God, not of works, lest anyone should boast"(Eph 2:8-9). "But to him who does not work but believes on him who justifies the ungodly, his faith is accounted for righteousness"(Rom 4:5). When we try to access salvation or any of the promises therein by our works we are contrary to the very nature of the gospel and will find ourselves frustrated and lacking. The Bible actually states that those who try to succeed by their works are bewitched(Gal 3:1) and cursed(Gal 3:10), because success can only come through believing.
Before Christ's coming, mankind was under the written requirements of God called the Law. Man was judged according to how he preformed and worked in regards to this law(Deut 28). His acceptance and eligibility for blessing were completely dependent upon his efforts. The purpose of the Law was to set a standard for pleasing God so high that all failed and would look to God for a savior and God provided that savior in Christ(Gal 3:24). Once we are led to Christ and become his righteousness by faith we no longer need the Law nor are we under the curses that come with failing in regards to it(Gal 3:25, Rom 7:4, 1 Tim 1:9). We are loved, accepted, in right-standing with God and blessed with every spiritual blessing(Eph 1:3-6). Therefore, when we mix our works into the gospel we try to gain something we already have, and add our failures and inabilities to the perfect accomplished work of the cross, taint it, and cause it to lose it's potency.
As just stated the purpose of the Law is to show us our inabilities to please and earn anything from God. It exists to expose failure(Rom 3:19-20), and is called a ministry of death(2 Cor 3:7).
The gospel on the other hand is success(Rom 8:31&37) and life(Jn 10:10). Therefore, if a Christian lives their life forgiven by faith in the gospel, but then tries to grow and overcome in their own efforts they are trying to mix life and death, success and failure, and will find themselves frustrated and fruitless. My argument is that if we completely rid ourselves of the works mentality and cast ourselves completely upon the grace, love, and faithfulness of God, we will find growth and victory as never before because we are leaning on the one who able and willing.
The Gospel is still the power of God unto salvation, and all the promises of our inheritance are still true and readily offered by our father. I believe when we abandon the diluted gospel mixed with striving and working, and turn to the pure Gospel of Grace by faith alone we will again see the life and city-shaking power of the Gospel.