Whatever may be said of the rational force of the evidence derived from phenomenal manifestations which we can observe when we reason about other phenomenal manifestations which we can not measure, it can not be said that we have reached a term in the relation that is beyond the sphere of thought. What I understand Mr. Spencer to mean when he speaks of "symbolizing" out of the materials which the phenomenal manifestations give us, may be a process liable to error, but it does not involve or lead to the "insoluble difficulties" that are supposed to arise. For example, when, from the existence and power of man, a being whom we know, and whose phenomenal manifestations lead us to a knowledge of his limited faculties, we reason to the existence of a being whose faculties are boundless, we may be in danger of conclusions into which imperfection will find its way; but it certainly is not true that in thinking of unlimited power or goodness, or any other unlimited quality, we transcend the sphere of thought. When we have expressed in figures the greatest measurable idea of space that can be so expressed, what do we "symbolize," when we say that beyond that measured space there stretches a space that we can not measure, and to which there is of necessity no limit? Does a thinkable relation cease to exist, because one of the terms is immeasurable to us? As soon as we have formed an idea of a measurable portion of space, we necessarily have an idea of endless and immeasurable space; and in this deduction we have employed no "symbol" formed out of the materials which the measurable manifestations have given us. We have simply reached a conclusion that is inevitable. We are all the while thinking of space, whether it is definite space that we can measure, or indefinite space that we can not measure.