Mathematicians have tried in vain to this day to discover some order in the sequence of prime numbers, and we have reason to believe that it is a mystery into which the human mind will never penetrate. Leonhard Euler
We conceal it from ourselves in vain - we must always love something. In those matters seemingly removed from love, the feeling is secretly to be found, and man cannot possibly live for a moment without it. Blaise Pascal
In life there is nothing more unexpected and surprising than the arrivals and departures of pleasure. If we find it in one place to-day, it is vain to seek it there to-morrow. You can not lay a trap for it. Alexander Smith
The promises of this world are, for the most part, vain phantoms; and to confide in one's self, and become something of worth and value is the best and safest course.
Death is not more certainly a separation of our souls from our bodies than the Christian life is a separation of our souls from worldly tempers, vain indulgences, and unnecessary cares. William Law
If a war be undertaken... before the resources of peace have been tried and proved vain to secure it, that war has no defense, it is a national crime. Charles Eliot Norton
It is vain to say human beings ought to be satisfied with tranquillity: they must have action; and they will make it if they cannot find it. Jacob Bronowski
When virtue and modesty enlighten her charms, the lustre of a beautiful woman is brighter than the stars of heaven, and the influence of her power it is in vain to resist.
Akhenaton