There are all kinds of silences and each of them means a different thing

If a man has any greatness in him, it comes to light, not in one flamboyant hour, but in the ledger of his daily work.

all the science of flying has been captured in the breadth of an instrument board, but not the religion of it.

there are many Africas.

Africa is never the same to anyone who leaves it and returns again. It is not a land of change, but it is a land of moods and its moods are numberless. It is not fickle, but because it has mothered not only men, but races, and cradles not only cities, but civilizations - and seen them die, and seen new ones born again - Africa can be dispassionate, indifferent, warm, or cynical, replete with the weariness of too much wisdom.

We fly, but we have not 'conquered' the air. Nature presides in all her dignity, permitting us the study and the use of such of her forces as we may understand. It is when we presume to intimacy, having been granted only tolerance, that the harsh stick fall across our impudent knuckles and we rub the pain, staring upward, startled by our ignorance.

I have a trunk containing continents.