From this videoconference talk from 26 July, 2019, Ajahn Anan discusses truthfulness and determination.

An excerpt: "All the people born in the world, whether a monk or layperson, must follow the law of karma. One does good, and one gets good results. One does bad, and one gets bad results. No one has the power to overcome the results of karma that one has done. But additana, determination, is building the power of one’s mind to be strong to set a goal, locking that goal in so that we will succeed in that. This sets the compass of one's life, so that it is straight. So, if we have enough strength of determination, then we will be able to succeed. Our minds need to build parami - build dana, giving, build sila, morality, build bhavana, mental development, build goodness, then our determinations will succeed."

Note: One can read this talk and others at the Wat Marp Jan 'Reflections' page, which also includes questions and answers with Ajahn Anan, which are not in the audio files. See: https://watmarpjan.org/en/dhamma-reflections/reflections-archive/