If all the arts aspire to the condition of music, all the sciences aspire to the condition of mathematics. - George Santayana

Wer sich an die Vergangenheit nicht erinnert, ist dazu verdammt sie zu wiederholen.

Love not as do the flesh-imprisoned men
Whose dreams are of a bitter bought caress,
Or even of a maiden's tenderness
Whom they love only that she loves again.
For it is but thyself thou lovest then,
Or what thy thoughts would glory to possess;
But love thou nothing thou wouldst love the less
If henceforth ever hidden from thy ken.
Love but the formless and eternal Whole
From whose effulgence one unheeded ray
Breaks on this prism of dissolving clay
Into the flickering colours of thy soul.
These flash and vanish; bid them not to stay,
For wisdom brightens as they fade away.

The Difficult is that which can be done immediately; the Impossible that which takes a little longer.