1. HardeningPerseverance/Resilience/Determination.

2. Checking our curiosityStaying focused.

The closest "correct" phrase would be "curbing our curiosity".. but that sounds weird here.

It's very easy to interrupt our tasks by checking something on our smartphonebe distracted by our smartphones when trying to complete tasks.

3. Burn ouring bridges.

If we can't work efficiently because of our distractions e.g. a smartphone or computer game, (we can take our smartphone to another room)- a strange use of personification- use this instead: we can place our smartphones in another room or uninstall the game.s on the phones.

5. PMaking something unpleasant and unmore pleasant.

We can connectmbine tasks which we don't like with tasks which we like (to do) e.g. cleaning the house and listening to the music.

6. GradationA gradual approach.

We should get used to the effort new routine steps-by-step.

When we feel dejectioned, we loste our motivation (to do something).

Nothing which requires the use of the past tense here.

Next time we will give ain to temptation easier.

How not to be lLazy?

We capitalize the first letter of important words when writing titles.

We shouldn't avoid what is inconvenient or harddifficult for us.

It's very easy to interruptget distracted from our tasks by checking for something on our smartphones.

3. Burn our bridgeRemoving our Distractions.

If we can't work efficiently because of our distractions, e.g., a smartphone or computer game, we can take our smartphone to another room or uninstall the game.

5. Pleasantness and unpleasantness.

For consistency

We can connect tasks which we don't like with taskhings which we like, e.g., cleaning the house andwhile listening to the music.

I just did this today, lol.

We should get used to thean effort in steps.

Let's start with something easier and then turn on the heatincrease the difficulty.

"Turn on the heat" is slang.

7. Looking for a senpurpose ofin life.

When we feel dejection, we loste our motivation.

A rich spiritual life based on praying, reading books about spirituality, using the sacrament of penance and communing regularly makes our relationship with God deeper and thereby we would see a point inill understand the reasons for our efforts.

8. Avoiding destructive argumentations.

We canmay hear a voice in our head the voice talking to uss saying "It's not a big deal if I do it later"."

NThe next time we will give amore easily avoid temptation easier.

When we feel dejectioned we loste our motivation.

I don’t think I’ve ever heard the word “dejection” before

Next time we will give a temptation easier.

“give a temptation” is not something used in American English. Maybe try “tempt someone”, but still I don’t “more easily” would make sense after “tempt someone”.

1. Hardening. Harden?

If you are attempting to give instructions then "Harden" would be better in this context over "Hardening"

We shouldn't avoid what is inconvenient or harddifficult for us.

I don't think how you wrote it would be grammatically incorrect but it sounds awkward because the word "hard" would rarely be used in that context.

2. Checking ourBe curiosity.us?

I am not sure what "Checking our curiosity" would mean. Do you mean that people must be more curious? Or do you mean that people must keep their curiosity under control?

It's very easy to interrupt our daily tasks by checking something on our smartphones.

This sentence was grammatically correct and quite well written for a non native speaker. However it was a bit awkward.

3. Burn our bridges.Remove Distractions?

This sentence could work. However typically in English "Burning Bridges" refers to ending relationships with other people or neglecting opportunities rather than talking about distractions.

4. Being afraid of punishmentfear the potential consequences.

Again "being" wouldn't be the correct word if you are instructing someone. Also the words selected were a bit awkward. Still not wrong though.

We can connect tasks whichthat we don't like with tasks whichthat we like e.g. cleaning the house and listening to the music.

"which" would not work in this context typically. "that" would be preferable.

Wwe should get used to the effort inincreasing effort with each steps.

Your sentence made sense but it was awkward and not the best given what was said in the next sentence.

Let's start with something easiery and then turn on the heat.

you are not comparing in this sentence. Therefore it is better to say easy rather than easier.

7. Looking for a senpurpose of life.

Again you must use the active rather than the passive form of the verb. Also purpose would work better here. Sense usually refers to understanding or intuition. i.e I have a sense that he is not a good person.

When we feel dejection we loste our motivation.

You changed the second verb to past tense for no reason. It should remain present.

A rich spiritual life based on praying, reading books about spirituality, using the sacrament of penance and communing regularly makes our relationship with God deeper and thereby we would see a point in our efforts.

This sentence is quite good

8. Avoiding destructive argumentationsways of thinking.

argumentations is a word that is almost never used in english. As a result this sentence sounds strange. "Ways of thinking" would be better.

We should be aware of our temptations which decrease our motivations because itbeing aware would helps us to avoid themour temptations and fight against them.

the sentence was a bit Awkward. However it did make sense.

We can hear in our head the voice talking toelling us "It's not a big deal if I do it later".

telling would be more often used in this context.

Next time we will give up a temptation easier.?

Did you mean "give up a temptation easier". Your sentence is unclear.

9. Developing the virtue of diligence.