It is in the world that a man, devout or other, has his life to lead, his work waiting to be done. Carlyle.
It is in trifles that the mind betrays itself. Bulwer.
It is in vain for a man to be born fortunate, if he be unfortunate in his marriage. Dacier.
It is incalculable what by arranging, commanding, and regimenting you can make of men. Carlyle.
It is inconceivable how much wit it requires 45 to avoid being ridiculous. Chamfort.
It is incredible how much the mind can do to sustain the body. Goethe.
It is indeed all twilight in this world, a trifle more or less. Goethe.
It is indeed only in old age that intellectual men attain their sublime expression. Schopenhauer.
It is infamy to die and not be missed. C. Wilcox.
It is invariably found that the contented man 50 is a weak man. John Wagstaffe.