Work at it night and day.
Alas! the fleeting years, how they roll on!
That man lives happy and in command of himself, who from day to day can say I have lived. Whether clouds obscure, or the sun illumines the following day, that which is past is beyond recall.
He tells old wives' tales much to the point.
Thus one thing requires assistance from another, and joins in friendly help.
To teach is to delight.