"By this we know that we have come to know Him, if we keep His commandments. The one who says, "I have come to know Him," and does not keep His commandments, is a liar, and the truth is not in him; but whoever keeps His word, in him the love of God has truly been perfected By this we know that we are in Him: the one who says he abides in Him ought himself to walk in the same manner as He walked." - 1 John 2:3-6

doesn't seem to get any clearer than this.

"But Jesus said to him, 'No one, after putting his hand to the plow and looking back, is fit for the kingdom of God.'" - Luke 9:62

or to quote Rich Mullins...
"It's about as useless as a screen door on a submarine
Faith without works, baby, it just ain't hapennin'"

God, make my faith more than just talk.