Conscience is the best guide, and experience the best teacher. Nature is the best book, and life the highest form of schooling. Death is the great graduation day.
In your absorption of knowledge, consider nothing impossible and nothing beyond achievement. Bear in mind that whatever is possible will one day come into being. The road to wisdom begins in attentive silence and passes through study and practice into fulfillment.
The man who quietly carries out the precepts of the Sacred Books and upholds their teachings is better than he who studies diligently and teaches well, but fails to put his teaching into practice. A hypocritical teacher is the lowest order of hypocrites.
The man who is filled with learning and knows all the wisdom of the Sacred Books but fails to put it into practice, is like a many-branched tree with no depth of root. The wind blows and it is laid low to quickly rot. The man with much learning and knowledge but no strength of character, is like a frail pot filled with precious liquid. If roughly handled it falls apart and the contents are lost.
Finally, if seeking a religious master be careful in your choice. In matters of religion the whole forces of evil are marshaled to deceive and delude. If one whom you would choose as a master seeks popularity or self-advancement, avoid him like the plague, for he is a false prophet.
~from the “Book of Wisdom” within “The Kolbrin,” Chapter 20; Teaching, Study and Learning