"What He Must Be . . . If He Wants to Marry My Daughter" by Voddie Baucham
I got curious and started reading it and even though I'not dating (nor do I ever plan on getting married), I found some useful stuff that encourages me towards biblical manhood.

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“God had one Son without sin, but not a single child without the rod”
"You cannot make a sinner into a saint by killing him. He who does not live as a saint here will never live as a saint hereafter."
~CH Spurgeon