I’ll be quick with this because I’ve been through it before; I find it amusing though, so bear with me.
espeak does basic text-to-speech conversion. fortune generates random passages of text. Mix them together and we have a random burst of wisdom from your erstwhile taciturn computer.
fortune | espeak
Of course, the wisdom it produces might be a little watered down; I’ve seen a lot of what fortune offers and it’s not always top-shelf advice.
So take your chances. If your computer mutters incomprehensible syllables, take it as a sign from the Computer God. If not, take it as a random twist of fate. 😉
P.S.: Take a look at the help flags, if the default voice for espeak is unintelligible.