Effort

Therefore, since we have so great a cloud of witnesses surrounding us, let us also lay aside every encumbrance and the sin which so easily entangles us, and let us run with endurance the race that is set before us, fixing our eyes on Jesus, the author and perfecter of faith, who for the joy set before Him endured the cross, despising the shame, and has sat down at the right hand of the throne of God
— Hebrews 12:1-2 (New American Standard)
Either make the tree good and its fruit good, or make the tree bad and its fruit bad; for the tree is known by its fruit. You brood of vipers, how can you, being evil, speak what is good? For the mouth speaks out of that which fills the heart. The good man brings out of his good treasure what is good; and the evil man brings out of his evil treasure what is evil.
— Matthew 12:33-35 (New American Standard)
My son, give attention to my words; Incline your ear to my sayings. Do not let them depart from your sight; Keep them in the midst of your heart. For they are life to those who find them And health to all their body. Watch over your heart with all diligence, For from it flow the springs of life.
— Proverbs 4:20-23 (New American Standard)
The four practices usually associated with Right Diligence are: (1) preventing unwholesome seeds in our store consciousness that have not yet arisen from arising, (2) helping the unwholesome seeds that have already arisen to return to our store consciousness, (3) finding ways to water the wholesome seeds in our store consciousness that have not yet arisen and asking our friends to do the same, and (4) nourishing the wholesome seeds that have arisen so they will stay present in our mind consciousness and grow stronger.
Thich Nhat Hanh, The Heart of the Buddha's Teaching, p 100
The first is that when negative emotions haven’t manifested in your mind, you don’t give them a chance to manifest.
Thich Nhat Hanh, The Art of Power, p 17
The second aspect of diligence is calming and replacing negative seeds that do manifest in your conscious mind.
Thich Nhat Hanh, The Art of Power, p 19
The third aspect of diligence is to always invite good seeds to manifest.
Thich Nhat Hanh, The Art of Power, p 20
The fourth aspect of diligence is trying to keep a good mental formation in the living room as long as possible.
Thich Nhat Hanh, The Art of Power, p 21