1 Corinthians 9:26

I therefore [realizing the value of that for which I contend] so run, as not uncertainly [without doubt or hesitation. Paul felt sure of the course which led to the goal, and certain as to the reward which he would attain when the race was over-- 2 Timothy 1:12; 2 Timothy 4:8]; so fight I, as not beating the air [The allusion here is to the boxer who, in blind confusion, strikes wide of the mark, and misses his antagonist. For an instance of vain effort similarly expressed, see 1 Corinthians 14:9; Virgil's Æneid 5:446]: