171 Avot 5/11-15

(11) There are four temperaments among dispositions: [a person who is] easy to anger and easy to appease -- his gain is canceled by his loss. [A person who is] hard to anger but [also] hard to appease -- his loss is canceled by his gain. [A person who is] hard to anger, but easy to appease -- [that's a] pious person. [A person who is] easy to anger and hard to appease -- [that's a] wicked person.

(12) There are four temperaments among students: Quick to understand and quick to forget -- his gain is canceled by his loss. [A student who is] slow to understand and slow to forget -- his loss is canceled by his gain. [A student who is] quick to understand and slow to forget -- he is a sage. [A student who is] slow to understand and quick to forget -- that is a bad portion.

(13) There are four temperaments among givers of charity: One who wishes to give, but [that] others not give -- he has an evil eye with respect to others. [One who wishes that] others give, and he [himself] not give -- he has an evil eye with respect to himself. [One who wishes to] give and [that] others give -- [that's a] pious person. [One who wishes] not to give and [that] others not give -- [that's a] wicked person.

(14) There are four temperaments among those who go to the House of Study: [One who] goes but does not do obtains the reward for going. [One who] does but does not go obtains reward for doing. [One who] goes and does is a pious person. [One who] neither goes nor does is a wicked person.

(15) There are four temperaments among those who sit before the sages: the sponge, the funnel, the strainer, and the sieve. The sponge -- because it absorbs everything. The funnel -- because it lets in at [one end] and lets out at [the other]. The strainer -- because it lets the wine out and retains the sediment. The sieve -- because it lets out the [inferior] flour and retains the fine flour.