1 Corinthians 9:26

Therefore I do not run without a definite goal; I do not flail around like one beating the air [just shadow boxing].

Matthew 11:12

From the days of John the Baptist until now the kingdom of heaven suffers violent assault, and violent men seize it by force [as a precious prize].

Luke 13:24

“Strive to enter through the narrow door [force aside unbelief and the attractions of sin]; for many, I tell you, will try to enter [by their own works] and will not be able.

1 Corinthians 14:9

So it is with you, if you speak words [in an unknown tongue] that are not intelligible and clear, how will anyone understand what you are saying? You will be talking into the air [wasting your breath]!

2 Corinthians 5:1

For we know that if the earthly tent [our physical body] which is our house is torn down [through death], we have a building from God, a house not made with hands, eternal in the heavens.

2 Corinthians 5:8

we are [as I was saying] of good courage and confident hope, and prefer rather to be absent from the body and to be at home with the Lord.

Ephesians 6:12

For our struggle is not against flesh and blood [contending only with physical opponents], but against the rulers, against the powers, against the world forces of this [present] darkness, against the spiritual forces of wickedness in the heavenly (supernatural) places.

Philippians 1:21

For to me, to live is Christ [He is my source of joy, my reason to live] and to die is gain [for I will be with Him in eternity].

Colossians 1:29

For this I labor [often to the point of exhaustion], striving with His power and energy, which so greatly works within me.

2 Timothy 1:12

This is why I suffer as I do. Still, I am not ashamed; for I know Him [and I am personally acquainted with Him] whom I have believed [with absolute trust and confidence in Him and in the truth of His deity], and I am persuaded [beyond any doubt] that He is able to guard that which I have entrusted to Him until that day [when I stand before Him].

2 Timothy 2:5

And if anyone competes as an athlete [in competitive games], he is not crowned [with the wreath of victory] unless he competes according to the rules.

Hebrews 4:1

Therefore, while the promise of entering His rest still remains and is freely offered today, let us fear, in case any one of you may seem to come short of reaching it or think he has come too late.

1 Peter 5:1

Therefore, I strongly urge the elders among you [pastors, spiritual leaders of the church], as a fellow elder and as an eyewitness [called to testify] of the sufferings of Christ, as well as one who shares in the glory that is to be revealed:

2 Peter 1:10

Therefore, believers, be all the more diligent to make certain about His calling and choosing you [be sure that your behavior reflects and confirms your relationship with God]; for by doing these things [actively developing these virtues], you will never stumble [in your spiritual growth and will live a life that leads others away from sin];

Treasury of Scripture Knowledge

Summary

I therefore so run, not as uncertainly; so fight I, not as one that beateth the air:

General references

Bible References

Not

2 Corinthians 5:1
For we know that if the earthly tent [our physical body] which is our house is torn down [through death], we have a building from God, a house not made with hands, eternal in the heavens.
Philippians 1:21
For to me, to live is Christ [He is my source of joy, my reason to live] and to die is gain [for I will be with Him in eternity].
2 Timothy 1:12
This is why I suffer as I do. Still, I am not ashamed; for I know Him [and I am personally acquainted with Him] whom I have believed [with absolute trust and confidence in Him and in the truth of His deity], and I am persuaded [beyond any doubt] that He is able to guard that which I have entrusted to Him until that day [when I stand before Him].
2 Timothy 2:5
And if anyone competes as an athlete [in competitive games], he is not crowned [with the wreath of victory] unless he competes according to the rules.
Hebrews 4:1
Therefore, while the promise of entering His rest still remains and is freely offered today, let us fear, in case any one of you may seem to come short of reaching it or think he has come too late.
1 Peter 5:1
Therefore, I strongly urge the elders among you [pastors, spiritual leaders of the church], as a fellow elder and as an eyewitness [called to testify] of the sufferings of Christ, as well as one who shares in the glory that is to be revealed:
2 Peter 1:10
Therefore, believers, be all the more diligent to make certain about His calling and choosing you [be sure that your behavior reflects and confirms your relationship with God]; for by doing these things [actively developing these virtues], you will never stumble [in your spiritual growth and will live a life that leads others away from sin];

So

Matthew 11:12
From the days of John the Baptist until now the kingdom of heaven suffers violent assault, and violent men seize it by force [as a precious prize].
Luke 13:24
“Strive to enter through the narrow door [force aside unbelief and the attractions of sin]; for many, I tell you, will try to enter [by their own works] and will not be able.
Ephesians 6:12
For our struggle is not against flesh and blood [contending only with physical opponents], but against the rulers, against the powers, against the world forces of this [present] darkness, against the spiritual forces of wickedness in the heavenly (supernatural) places.
Colossians 1:29
For this I labor [often to the point of exhaustion], striving with His power and energy, which so greatly works within me.

General references

2 Chronicles 14:12
So the Lord struck the Ethiopians [with defeat] before Asa and Judah, and the Ethiopians fled.