Imperturbability means coolness and presence of mind under all circumstances, calmness amid storm, clearness of judgment in moments of grave peril, immobility, impassiveness, or, to use an old and expressive word, phlegm.
Valedictory address to the graduating class at the University of Pennsylvania, and the source of the word Osler made his motto.
Take no thought for the morrow. Live neither in the past nor in the future, but let each day's work absorb your entire energies, and satisfy your widest ambition.
To the graduating class of the Army Medical School, Washington.
Let the day's work suffice; live for it, regardless of what the future has in store, believing that to-morrow should take thought for the things of itself.
The teacher encourages action despite uncertainty about conditions and outcomes.
In the morning sow your seed, and in the evening don’t withhold your hand; for you don’t know which will prosper, whether this or that, or whether they both will be equally good.