Galatians 3:4

Did ye suffer so many things in vain? if, indeed, it be even in vain.

2 John 1:8

Take heed to yourselves, that ye lose not the things which we wrought, but that ye receive a full reward.

1 Corinthians 15:2

through which also ye are saved, if ye hold fast the word which I proclaimed to you, unless ye believed in vain.

Hebrews 6:4-6

For as to those who were once enlightened, and tasted of the heavenly gift, and became partakers of the Holy Spirit,

Hebrews 10:32-39

But call to remembrance the former days, in which, after ye were enlightened, ye endured a great conflict of sufferings;

2 Peter 2:20-22

For if, after having escaped the defilements of the world in a full knowledge of our Lord and Savior Jesus Christ, but, having again become entangled with these, they are overcome, the last state has become worse with them than the first.

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