Jesus tells us to love one another, always. But sometimes we may meet people who we believe are genuinely unloveable by any human standards. That is when we let God love them through us.
So finally we tumble into the abyss, we ask God why he has made us so feeble. But, in spite of ourselves, He replies through our consciences: 'I have made you too feeble to climb out of the pit, because i made you strong enough not to fall in.