In mathematics, as in physics, so much depends on chance, on a propitious moment.
It is when fortune is the most propitious that she is least to be trusted.livy
If hindrances obstruct thy way, Thy magnanimity display. And let thy strength be seen: But O, if Fortune fill thy sail With more than a propitious gale, Take half thy canvas in.william cowper
After any disturbance (such as two world wars coinciding with a period of growing economic and monetary incomprehensibility) we find our old concepts inadequate and look for new ones. But it unfortunately happens that the troubled times which produce an appetite for new ideas are the least propitious for clear thinking.rebecca west
The propitious smiles of Heaven can never be expected on a nation that disregards the eternal rules of order and right, which Heaven itself has ordained.
It is when fortune is the most propitious that she is least to be trusted.