The struggle is always worthwhile, if the end be worthwhile and the means honorable; foreknowledge of defeat is not sufficient reason to withdraw from the contest. Steven Brust
The fishermen know that the sea is dangerous and the storm terrible, but they have never found these dangers sufficient reason for remaining ashore. Vincent van Gogh
My dad hates umbrellas, said Deeba, swinging her own. When it rains he always says the same thing. 'I do not believe the presence of moisture in the air is sufficient reason to overturn society's usual sensible taboo against wielding spiked clubs at eye level. China Miéville
The truth is, however, that every religion form is superior to the others in a particular respect, and it is this characteristic that in fact indicates the sufficient reason for the existence of that form. Frithjof Schuon
If one has no vanity in this life of ours, there is no sufficient reason for living. Leo Tolstoy
When the virus of restlessness begins to take possession of a wayward man, and the road away from Here seems broad and straight and sweet, the victim must first find himself a good and sufficient reason for going. John Steinbeck