1 Timothy 6:12
Fight the good fight of faith, lay hold on eternal life, whereunto thou art also called, and hast professed a good profession before many witnesses.
Note 10 at 1Ti 6:12: The Greek word that was translated "fight" here is "AGONIZOMAI," and it means "to struggle, literally (to compete for a prize), figuratively (to contend with an adversary), or genitive case (to endeavor to accomplish something)" (Strong's Concordance). It comes from the same root word that we get the English words "agony" and "agonize" from. AGONIZOMAI was translated "strive" in Lu 13:24 and "striveth" in 1Co 9:25.
There is a struggle in the Christian life. The struggle isn't with God, but with ourselves and the devil's lies. There is no exemption from this fight. Those who refuse to fight, lose.
Note 11 at 1Ti 6:12: Some people think there is no such thing as a good fight. They are only interested in the things that come effortlessly. The Christian fight is good because it has already been won by Jesus. All believers are doing is enforcing His victory. That makes for a good fight.
Note 12 at 1Ti 6:12: This phrase, "lay hold on," is speaking of seizing the opportunity. Just as those who have been thrown a rope for their rescue have to "lay hold" of that rope to be pulled to safety, so we have to "lay hold on eternal life" to reap its benefits. God gives us eternal life by His grace, but we have to put forth some effort to "lay hold" of it (see note 7 at Ga 1:15 and note 19 at 1Co 15:10).
Note 13 at 1Ti 6:12: As described in note 94 at Joh 17:3, eternal life is more than living forever. It is intimacy with God the Father and Jesus Christ through the Holy Spirit. A parallel statement by Paul in 1Co 1:9 further establishes that eternal life is intimate fellowship with the Father.
Note 14 at 1Ti 6:12: Paul must have been referring to some public profession that Timothy had made, possibly at his salvation experience, baptism, or ordination.