Sharpen the Tools
Your experience has proven that poor, weak impressions are recalled slowly and with difficulty. At the same time when you succeed in recalling a poorly made impression it is indistinct, it lacks that clear definiteness which brings assurance and confidence. To overcome this you need to sharpen the tools with which the impressions are made upon the brain. You cannot expect the best results from untrained senses any more than a carpenter can expect to do a fine quality of work with dull tools.
The senses can be sharpened and improved as you have seen in the First Book, but practice is the whetstone and every stroke will produce its proportionate result; without it you can not expect to become proficient in anything. The methods by which the senses can be trained are suggested in the First Book, and if they have been overlooked, or slighted, you can now see the importance of paying proper attention to them.
Practice is the motive power which can propel you along the road of progress toward the goal of perfection.