Which scenario gives the best reason for consulting a book of quotations

Consulting a book of quotations is a good idea if one wants to drive home a point in one's writing, say of a non-fiction book but could be fiction too, such as "it takes 20 years to get 20 years experience" meaning there are no shortcuts to genuine learning or say in Spanish "no hay mal que bien no venga" in other words there is no bad thing that something good does not come of it or there is two sides to everything so the point with quotations is to succinctly give a message hopefully as a summing up of a lifetime of experience of those who the saying comes from.