mistake, trust, enticement

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Some mistake may ruin the day.
Some mistake may ruin the whole life.

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The first time is critical not only because it is the first one
but also because it presents the procedure to evolve from 0 to 1,
which can be repeatedly(repetitively) applied to the following.

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A mistake may ruin the day.
A critical mistake may ruin the life.
That means, just one time may become forever nightmare!

Only trust a person when he is trustworthy.

just one time -> sometime -> all the time

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Somebody said "If you have a trustworthy companion, it may be fine to have just one time trial of marijuana. ... When the drug takes effect, feeling floating to the air,as powerful as superman..., after the effect fades,headache, ... follows"

That is a fake! A hidden enticement!

How about this? "Just one time may be fine, to rob the bank and become billionaire and never rob it again?"