Christ has made each of us His ambassadors here on earth. He is no longer here in the flesh, and so now He expects us to faithfully and effectively represent Him. As His ambassadors or representatives, He has given us two basic tasks to perform.
First of all, we are to spread the good news of salvation in such a way that unbelievers will be drawn to the light and out of their darkness. "To open their eyes, and to turn them from darkness to light, and from the power of Satan unto God, that they may receive forgiveness of sins, and inheritance among them which are sanctified by faith that is in me" (Acts 26:18). To do this, an ambassador must live a life of conformity to His life and teachings. "As he which hath called you is holy, so be ye holy in all manner of conversation" (1 Peter 1:15), adequately representing Him.
Secondly, we are to saturate ourselves totally with the knowledge of His will and His Word so that we will be enabled to encourage other Christians, strengthening them for their duties as ambassadors as well. "Study to shew thyself approved unto God, a workman that needeth not to be ashamed, rightly dividing the word of truth" (2 Timothy 2:15), applying our attention to His directives. "All Scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness: That the man of God may be perfect, throughly furnished unto all good works" (2 Timothy 3:16-17).
It has rightly been said that the only two things which will last for eternity are people and the Word of God. These things must occupy our attention if we are to be effective "ambassadors for Christ." JDM