Facts are many, but the truth is one. The animal intelligence knows facts, the human mind has power to apprehend truth. The apple falls from the tree, the rain descends upon the earth—you can go on burdening your memory with such facts and never come to an end. But once you get hold of the law of gravitation you can dispense with the necessity of collecting facts ad infinitum. You have got at one truth which governs numberless facts. This discovery of truth is pure joy to man—it is a liberation of his mind. For, a mere fact is like a blind lane, it leads only to itself—it has no beyond. But a truth opens up a whole horizon, it leads us to the infinite. That is the reason why, when a man like Darwin discovers some simple general truth about Biology, it does not stop there, but like a lamp shedding its light far beyond the object for which it was lighted, it illumines the whole region of human life and thought, transcending its original purpose. Thus we find that truth, while investing all facts, is not a mere aggregate of facts—it surpasses them on all sides and points to the infinite reality.

As in the region of knowledge so in that of consciousness, man must clearly realise some central truth which will give him an outlook over the widest possible field. And that is the object which the Upanishad has in view when it says, Know thine own Soul. Or, in other words, realise the one great principal of unity that there is in every man.

All our egoistic impulses, our selfish desires, obscure our true vision of the soul. For they only indicate our own narrow self. When we are conscious of our soul, we perceive the inner being that transcends our ego and has its deeper affinity with the All.

Children, when they begin to learn each separate letter of the alphabet, find no pleasure in it, because they miss the real purpose of the lesson; in fact, while letters claim our attention only in themselves and as isolated things, they fatigue us. They become a source of joy to us only when they combine into words and sentences and convey an idea.

Likewise, our soul when detached and imprisoned within the narrow limits of a self loses its significance. For its very essence is unity. It can only find out its truth by unifying itself with others, and only then it has its joy. Man was troubled and he lived in a state of fear so long as he had not discovered the uniformity of law in nature; till then the world was alien to him. The law that he discovered is nothing but the perception of harmony that prevails between reason which is of the soul of man and the workings of the world. This is the bond of union through which man is related to the world in which he lives, and he feels an exceeding joy when he finds this out, for then he realises himself in his surroundings. To understand anything is to find in it something which is our own, and it is the discovery of ourselves outside us which makes us glad. This relation of understanding is partial, but the relation of love is complete. In love the sense of difference is obliterated and the human soul fulfils its purpose in perfection, transcending the limits of itself and reaching across the threshold of the infinite. Therefore love is the highest bliss that man can attain to, for through it alone he truly knows that he is more than himself, and that he is at one with the All.

This principal of unity which man has in his soul is ever active, establishing relations far and wide through literature, art, and science, society, statecraft, and religion. Our great Revealers are they who make manifest the true meaning of the soul by giving up self for the love of mankind. They face calumny and persecution, deprivation and death in their service of love. They live the life of the soul, not of the self, and thus they prove to us the ultimate truth of humanity. We call them Mahātmās, "the men of the great soul."

It is said in one of the Upanishads: It is not that thou lovest thy son because thou desirest him, but thou lovest thy son because thou desirest thine own soul. [Footnote: Na vā arē putrasya kāmāya putrah priyō bhavati, ātmanastu kāmāya putrah priyō bhavati.] The meaning of this is, that whomsoever we love, in him we find our own soul in the highest sense. The final truth of our existence lies in this. Paramātmā, the supreme soul, is in me, as well as in my son, and my joy in my son is the realisation of this truth. It has become quite a commonplace fact, yet it is wonderful to think upon, that the joys and sorrows of our loved ones are joys and sorrows to us—nay they are more. Why so? Because in them we have grown larger, in them we have touched that great truth which comprehends the whole universe.

It very often happens that our love for our children, our friends, or other loved ones, debars us from the further realisation of our soul. It enlarges our scope of consciousness, no doubt, yet it sets a limit to its freest expansion. Nevertheless, it is the first step, and all the wonder lies in this first step itself. It shows to us the true nature of our soul. From it we know, for certain, that our highest joy is in the losing of our egoistic self and in the uniting with others. This love gives us a new power and insight and beauty of mind to the extent of the limits we set around it, but ceases to do so if those limits lose their elasticity, and militate against the spirit of love altogether; then our friendships become exclusive, our families selfish and inhospitable, our nations insular and aggressively inimical to other races.