There cannot be mental atrophy in any person who continues to observe, to remember what he observes, and to seek answers for his unceasing hows and whys about things.

Concentrate all your thoughts upon the work at hand. The sun's rays do not burn until brought to a focus.

When one door closes, another one opens.

Sometimes we stare so long at a door that is closing that we see too late the one that is open.

Night is a more quiet time to work. It aids thought.

When one door closes, another opens; but we often look so long and so regretfully upon the closed door that we do not see the one which has opened for us.

Ordinary people who know nothing of phonetics or elocution have difficulties in understanding slow speech composed of perfect sounds, while they have no difficulty in comprehending an imperfect gabble if only the accent and rhythm are natural.