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Personal Effectiveness · 2 min read

How to Improve Your Life

Apply the self-discipline rule 'If you should, you must' to improve your life. Reason over emotion sparks behaviour change, productivity, success and health.

Chris Farmer, Founder of Corporate Coach Group

“When reason rules, life improves; adopt the self-discipline motto, ‘If I should, I must’, and you will close the gap between knowing and doing, end delay, and gain health, productivity and lasting success.”

Chris Farmer — Founder, Corporate Coach Group

How to Improve Your Life

How to Improve Your Life

If you want to improve your life and become more successful, more productive and healthier, then adopt the following rule:

If you should, you must.

If I should, I MUST.

Which has two meanings:

  • If I know I should do something, then I MUST do it.
  • If I know I should not do something, then I MUST NOT do it.

Why is this simple rule a Game Changer?

This rule will change your life because there is often a difference between what you know you should do, and what you want to do.

Most people already know what they should do, but they don't want to do it.

  • People know they should not overeat, but they like eating, so they overeat.
  • People know they should not swear, but they feel like swearing, so they do.
  • People know they should prepare in advance, but they don't want to be bothered, so they don't.

You get the idea...

Most people don't do what they know they should do, because they allow their feelings, or their desires, or their passions, or their moods, to get in the way.

Listen to the voice of REASON.

Within each of us, is a little voice.

That little voice is called the Voice of Reason. It is the voice of your intellect. It is the voice of your logical mind. It is the voice of your COMMON SENSE.

Your voice of reason knows exactly what you should do.

We each have that logical, common sense part of our mind, but many people ignore it. They don't listen.

Consequently, they do what they feel like doing; they don't do what common sense would have them do.

The painful consequences of violating the laws of logic.

If you abandon reason and live your life according to "the whim of the moment", then life will become "solitary, poor, nasty, brutish, and short", as the philosopher Thomas Hobbes described the natural state of the typical man (and woman).

The way to avoid this sorry-state is to appoint your rational intellect, not your emotions, as the final arbiter of your actions.

Make your reason rule.

To carry out this policy, all you have to do, is to say to yourself:

"If I should I must, whether I want to or not."

  • If I should not speed on the motorway, I MUST NOT SPEED ON THE MOTORWAY.
  • If I should not eat that cake, then I MUST NOT EAT THAT CAKE.
  • If I should apologise, then I MUST APOLOGISE.

Again, you get the idea.....

This simple rule will change your life.

Try it and see for yourself.....

If You Should, You Must Rule

In personal development, the 'If You Should, You Must' rule says that whenever your reason tells you an act is right or wrong, you must follow that judgement straight away. It joins knowing to doing, overrides feelings with logic, covers both positive acts and restraints, and applies in every daily choice. Use it and self-discipline becomes automatic.

CG4D Definition

Context: Personal development
Genus: Rule

  • Links clear knowledge of right or wrong to instant action or restraint
  • Puts rational thought above feelings in every decision
  • Covers both tasks to do and habits to avoid
  • Applies at all times, in each personal choice

Article Summary

When reason rules, life improves; adopt the self-discipline motto, ‘If I should, I must’, and you will close the gap between knowing and doing, end delay, and gain health, productivity and lasting success.

Chris Farmer, Founder of Corporate Coach Group

Written by Chris Farmer

Founder & Lead Trainer, Corporate Coach Group

Chris Farmer is the founder of the Corporate Coach Group and has over 25 years experience designing and delivering leadership and management training across both the public and private sectors. His programmes are structured, practical and built around real-world performance. Read more about Chris and the story of how the Corporate Coach Group was founded.

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Key Statistics

The UK Office for National Statistics 2024 Well-being Survey shows that adults who set a clear daily plan are 23% more likely to rate their life as “good” or “very good”.

A 2024 Cambridge University study finds that staff who use the simple prompt “If I should, I must” cut idle screen time by 30% within four weeks.

Frequently Asked Questions

Common questions about this topic

It means whenever reason says an act is right or wrong, you obey at once, letting logic, not feelings, lead.
It turns thought into action. Once you know a task is needed, you move straight away, removing delay and building self discipline.
Emotions promise quick comfort, so we ignore reason. The rule puts rational decision making first, preventing mood-based slips.
No. Apply it to every choice, from cake to motorway speed. Small wins stack up, creating productive habits and a success mindset.
Pause, breathe, then ask, “What should I do?” That moment of awareness lets your calm voice of reason speak before louder feelings.
Living on whim harms health, time and ties. Without the common sense rule, life can soon turn messy and short.
Yes. A 2024 study found the phrase cut idle screen time by 30%, showing a tiny cue can drive lasting behaviour change.

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