"And it came to pass, when Joshua was by Jericho, that he lifted up his eyes and looked, and behold, there stood a man over against him with his sword drawn in his hand: and Joshua went unto him, and said unto him, Art thou for us, or for our adversaries? And he said, Nay; but as captain of the host of the Lord am I now come. And Joshua fell on his face to the earth, and did worship, and said unto him, What saith my lord unto his servant?" (Joshua 5:13-14)
Of course you know, this means war
Life is busy, no doubt there. And I'm not asking you to stop what you're doing to engage in irrationalities and things that have no bearing on where you're headed. Joshua, in the above passage, has the right idea. When God sends someone who has it under control (as did Jesus--I've read that this is one of the "types" of Him as found in the Old Testament), best to pay them heed. To take their advice and humble oneself in light of someone who has gone before. How often does someone stop you to tell you something you might not have been aware of? Everything from a direct word or warning from the Lord for your situation, to someone telling you your taillight's out or you need to put air in your front tire. This might be a broad allusion but anything of this nature is coming directly from God's heart and mind, to you. He's looking out for you.
"No man that warreth entangleth himself with the affairs of this life; that he may please him who hath called him to be a soldier. And if a man also strive for masteries, yet is he not crowned, except he strive lawfully." (1 Timothy 2:4-5)
And here's the thing. We are all here (provided we're believers in Jesus) to serve the Lord. This takes whatever fluid form the Holy Spirit intimates to your heart but I can tell you that it centers around both ministering to Him. And ministering to others. Know that no person at all is the enemy. Everyone is either fighting for God or a prisoner of war:
"For we wrestle not against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this world, against spiritual wickedness in high places. Wherefore take unto you the whole armour of God, that ye may be able to withstand in the evil day, and having done all, to stand." (Ephesians 6:12-13)
In your corner
Paul goes on to delineate the various types of "armour" that we are to wear. It ends in sounding cliched and cute (how many Christian-y things have you seen that depict the whole armor of God as a literal suit of armor yet don't go to the top floor regarding the seriousness and confusion of life?) if we don't realize that we are fighting battles and in a war from the moment we accept Christ as Savior. There are people in my life with whom I clashed at a certain point in my development and who I don't see or have contact with anymore but miss terribly. You see, I grew through the fight and with God's help, learned to forgive and love them. And now, I'd love to have them part of my life again. They weren't the enemy.
"The fruit of the righteous is a tree of life; and he that winneth souls is wise." (Proverbs 11:30, emphasis mine)
If we're only living for ourselves, we'll not see the state of those whom we're destined to help to God. God aims at getting as many people to be with Him (and you) in Heaven as possible. Take some time and ask the Holy Spirit to key you in to those that need a little extra something in order to see them end in asking Jesus into their heart. The general observes from the hill. But Jesus came and died.
"Who is this King of glory? The Lord strong and mighty, the Lord mighty in battle." (Psalm 24:10)