Ledi Sayadaw on Kamma

"Kamma is determined to be good or evil according to whether it leads to the cultivation and growth of one’s own mind and the benefit of others, or to the deterioration and defilement of one’s own mind and the harm of others. Thus by doing the following ten types of deeds one makes evil or unwholesome kamma which will bear the fruits of suffering, but by abstaining from these ten and cultivating their opposites one makes good kamma which will bear the fruits of happiness. These ten are as follows:

1. Injuring and killing living beings
2. Stealing
3. Wrong conduct in sexual pleasures
4. False speech
5. Tale-bearing
6. Harsh talk
7. Useless chatter
8. Covetousness
9. Ill will
10. Wrong view

"All kinds of actions done through the 'three doors' of body, speech, and mind, that are free of these ten ways of making unwholesome kamma ... are good kamma made in the present existence and coming to fruition now. But those actions by way of the three doors which are involved with the above ten, in whatsoever connection they are done, are evil kamma which bears its fruit in the present life.

"In a similar way kammas made in this life and due to ripen in the future will also be of two kinds, either wholesome or unwholesome. ..."

~ Magganga-dipani (The Noble Eightfold Path and its Factors Explained)