There are many ways in which a man can manifest himself. By his thought, he is always known to God and to his own heart, but not to his fellow men. To reveal himself to them, his thought must somehow find expression. His actions are mostly intentional and deliberate; but they are liable to be prompted, inspired, checked, or controlled by circumstances. So, too, may be his speech; but there is a spontaneousness, a freedom, in _that_, which belongs to no other manifestation of the man's inward self. Thus it is by his words that he is best judged. The largest part of our practical life is resolvable into speech. Christianity itself is amenable to this law. Think of the streams of holy speech which have been flowing through the world for ages, and of the life they have conveyed to thirsty souls. Think of these streams as they are flowing to-day in tens of thousands of Christian congregations, and in innumerable Sabbath schools. Compare their influence with that of the dark utterances of heathenism, and the disturbing teachings of unbelief. Think of the countless rills of Christian speech which are flowing to-day from the lips of those who love the Saviour, and who are endeavouring to make Him known in the home, in the sick-chamber, in the prison-house, and in their various intercourse with those around them. Compare their influence with that of the idle, thoughtless, impious, profane talk of the millions who are living without God; and then say whether Christianity may or may not be judged by its words! Lord Jesus, Thou needest no justification from such imperfect creatures as we are; but if Thou didst, it would be enough for us to recall the gracious words that proceeded out of thine own mouth, and then to challenge the wisdom of the ages, saying, "Never man spake like this man!" The general drift of the passage before us is this, that man speaks as he is, and is as he speaks, and that, therefore, by his words he shall be judged. His words are signs which reveal his character. Whilst, at the last, he will be judged by his character, single words and unnoticed deeds will, if need be, be adduced as proofs of inner and underlying principles. Of course it is not meant that words will be the only tests; but our Lord's language shows that they form a far more important element of proof than is commonly supposed. In this light, no manifestation of character is insignificant. Everything tells. Words, looks, even gestures, have their meaning. Often to men's eyes, and always to God's (though He does not need them) they are as straws on the stream, showing the course of the current. These general reflections supply the basis of the further reflections I have to offer. My purpose is twofold: first, to show that, for good or ill, the life of every one of us is an incessant exercise of influence; and secondly, to deduce from this fact some important lessons.