Upvote:1
Perhaps you're thinking about the Lonaphala Sutta:
"Suppose that a man were to drop a salt crystal into a small amount of water in a cup. What do you think? Would the water in the cup become salty because of the salt crystal, and unfit to drink?"
"Yes, lord. Why is that? There being only a small amount of water in the cup, it would become salty because of the salt crystal, and unfit to drink."
"Now suppose that a man were to drop a salt crystal into the River Ganges. What do you think? Would the water in the River Ganges become salty because of the salt crystal, and unfit to drink?"
"No, lord. Why is that? There being a great mass of water in the River Ganges, it would not become salty because of the salt crystal or unfit to drink."
"In the same way, there is the case where a trifling evil deed done by one individual [the first] takes him to hell; and there is the case where the very same sort of trifling deed done by the other individual is experienced in the here & now, and for the most part barely appears for a moment.
'Now, a trifling evil act done by what sort of individual takes him to hell? There is the case where a certain individual is undeveloped in the body, undeveloped in virtue, undeveloped in mind [i.e., painful feelings can invade the mind and stay there], undeveloped in discernment: restricted, small-hearted, dwelling with suffering. A trifling evil act done by this sort of individual takes him to hell.
'Now, a trifling evil act done by what sort of individual is experienced in the here & now, and for the most part barely appears for a moment? There is the case where a certain individual is developed in the body, developed in virtue, developed in mind [i.e., painful feelings cannot invade the mind and stay there], developed in discernment: unrestricted, large-hearted, dwelling with the immeasurable. A trifling evil act done by this sort of individual is experienced in the here & now, and for the most part barely appears for a moment.
Upvote:4
The following sutta is not about kamma (but is about internal defilements).
Mendicants, these four people are found in the world. What four? One person with a blemish (aṅgaṇa) doesn’t truly understand: ‘There is a blemish in me.’ But another person with a blemish does truly understand: ‘There is a blemish in me.’ One person without a blemish doesn’t truly understand: ‘There is no blemish in me.’ But another person without a blemish does truly understand: ‘There is no blemish in me.’ In this case, of the two persons with a blemish, the one who doesn’t understand is said to be worse, while the one who does understand is better. And of the two persons without a blemish, the one who doesn’t understand is said to be worse, while the one who does understand is better.
MN 5
I cannot imagine knowingly doing evil wicked kamma is better than not knowingly doing evil wicked kamma (such as the wicked Mara kamma of reviling Noble Ones & making false declarations of jhana attainment). Knowingly doing evil wicked kamma sounds psychopathic.