From Swami Sivananda's Daily Reading:
MAINTAIN SPIRITUAL DIARY
Every student should maintain a spiritual dairy. Then only can defects by rectified and the mind controlled. The spirit of serving the humanity must be ingrained in the heart of every aspirant. Sattvic virtues such as mercy, generosity, tolerance, forgiveness, nobility must be developed.
Keep a daily spiritual diary. Note down in the diary when you become angry towards others and when you hurt the feelings of others. This is very important. If you exhibit anger or hurt others, impose some self-punishment on yourself. Give up your meals at night. Do fifty more Maalas of Japa. Write in the diary, I have forgotten God twice this day. If you proceed like this for one or two years you will attain remarkable Shanti, progress and will power.
While reading The Eternal Companion today I came across something quite similar:
Devote some time every day to self-analysis. Ask yourself: "Why have I come here? How am I passing my time? Do I really want God? Am I really struggling to find him?" A man's mind tries to deceive him, but he must not allow himself to be swayed by his mind; he must curb and rule it. Hold fast to the truth. Be pure-hearted. The purer you become the more will your mind be absorbed in God. You will be able to see the subtle deceptions of the mind, and you will be able to root them out. Who are your enemies? Your own senses. But if you can control them they will become your friends. Your mind is your only enemy, and your mind is your only friend. The man who analyzes himself thus can wipe out the subtle deceptions of the mind, and by doing so move rapidly along the path of spirtuality.