The first and perhaps the most important point is that the mind is incapable of judging spiritual things. All those who have written on this subject have said so; but very few are those who have put it into practice. And yet, in order to proceed on the path, it is absolutely indispensable to abstain from all mental opinion and reaction.
Give up all personal seeking for comfort, satisfaction, enjoyment or happiness. Be only a burning fire for progress, take whatever comes to you as an aid to your progress and immediately make whatever progress is required.
Try to take pleasure in all you do, but never do anything for the sake of pleasure.
Never get excited, nervous or agitated. Remain perfectly calm in the face of all circumstances. And yet be always alert to discover what progress you still have to make and lose no time in making it.
Never take physical happenings at their face value. They are always a clumsy attempt to express something else, the true thing which escapes our superficial understanding.
Never complain of the behaviour of anyone, unless you have the power to change in his nature what makes him act in this way; and if you have the power, change him instead of complaining.
Whatever you do, never forget the goal which you have set before you. There is nothing great or small once you have set out on this great discovery; all things are equally important and can either hasten or delay its success. Thus before you eat, concentrate a few seconds in the aspiration that the food you are about to eat may bring your body the substance it needs to serve as a solid basis for your effort towards the great discovery, and give it the energy for persistence and perseverance in the effort.
Before you go to sleep, concentrate a few seconds in the aspiration that the sleep may restore your fatigued nerves, bring calm and quietness to your brain so that on waking you may, with renewed vigour, begin again your journey on the path of the great discovery.
Before you act, concentrate in the will that your action may help or at least in no way hinder your march forward towards the great discovery.
When you speak, before the words come out of your mouth, concentrate just long enough to check your words and allow only those that are absolutely necessary to pass, only those that are not in any way harmful to your progress on the path of the great discovery.
To sum up, never forget the purpose and goal of your life. The will for the great discovery should be always there above you, above what you do and what you are, like a huge bird of light dominating all the movements of your being.
Before the untiring persistence of your effort, an inner door will suddenly open and you will emerge into a dazzling splendour that will bring you the certitude of immortality, the concrete experience that you have always lived and always shall live, that external forms alone perish and that these forms are, in relation to what you are in reality, like clothes that are thrown away when worn out. Then you will stand erect, freed from all chains, and instead of advancing laboriously under the weight of circumstances imposed upon you by Nature, which you had to endure and bear if you did not want to be crushed by them, you will be able to walk on, straight and firm, conscious of your destiny, master of your life.
Ref : On Education