The man who can be nothing but serious or nothing but merry is but half a man. Leigh Hunt.
The man who can thank himself alone for the happiness he enjoys is truly blest. Goldsmith.
The man who cannot be a Christian in the 40 place where he is, cannot be a Christian anywhere. Ward Beecher.
The man who cannot blush, and who has no feelings of fear, has reached the acme of impudence. Menander.
The man who cannot enjoy his natural gifts in silence, and find his reward in the exercise of them, but must wait and hope for their recognition by others, must expect to reap only disappointment and vexation. Goethe.
The man who cannot laugh is not only fit for treasons, stratagems, and spoils; but his own whole life is already a treason and a stratagem. Carlyle.
The man who cannot sometimes endure his own company must have a bad heart or a deficient intellect. (?)
The man who cannot wonder, who does not habitually wonder (and worship), were he president of innumerable royal societies, and carried the whole "Méchanique Céleste" and Hegel's Philosophy, and the epitome of all laboratories and observatories with their results, in his single head, is but a pair of spectacles behind which there is no eye. Carlyle.
The man who does not know when to die, does not know how to live. Ruskin.
The man who does not learn to live while he is 5 getting a living is a poorer man after his wealth is won than he was before. J. G. Holland.