But no one from an acquaintance with Vedic or ordinary literary Sanskrit can have any idea of the difficulty of the logical and abstruse parts of Sanskrit philosophical literature. A man who can easily understand the Vedas. the Upani@sads, the Purânas, the Law Books and the literary works, and is also well acquainted with European philosophical thought, may find it literally impossible to understand even small portions of a work of advanced Indian logic, or the dialectical Vedânta. This is due to two reasons, the use of technical terms and of great condensation in expression, and the hidden allusions to doctrines of other systems. The 2 tendency to conceiving philosophical problems in a clear and unambiguous manner is an important feature of Sanskrit thought, but from the ninth century onwards, the habit of using clear, definite, and precise expressions, began to develop in a very striking manner, and as a result of that a large number of technical terms began to be invented. These terms are seldom properly explained, and it is presupposed that the reader who wants to read the works should have a knowledge of them. Any one in olden times who took to the study of any system of philosophy, had to do so with a teacher, who explained those terms to him. The teacher himself had got it from his teacher, and he from his. There was no tendency to popularize philosophy, for the idea then prevalent was that only the chosen few who had otherwise shown their fitness, deserved to become fit students (_adhikârî_) of philosophy, under the direction of a teacher. Only those who had the grit and high moral strength to devote their whole life to the true understanding of philosophy and the rebuilding of life in accordance with the high truths of philosophy were allowed to study it.