Depth and strength of a human character are defined by its moral reserves.
To make a perfume, take some rose water and wash your hands in it, then take a lavender flower and rub it with your palms, and you will achieve the desired effect
Reprove your friend in secret and praise him openly.
It is useful to constantly observe, note, and consider.
Therefore, O students, study mathematics and do not build without foundations.
Nothing will be left, Nothing in the air, nothing under the earth, nothing in the waters. All will be exterminated.