Chagigah 19a Mindfulness and Intentionality - טבל ולא הוחזק אסור למעשר ומותר לחולין

Matmonim: Daf Yomi by Rabbi David Lapin - A podcast by Rabbi David Lapin

To be mindful is to be aware of what we do. To be intentional is to be aware of what we are doing it for. Sources