It is obvious that Christ and Paul were familiar with Sirach.

Part of the Lord's Prayer has its roots in Sirach. Christ said to his followers, "For if you forgive men their trespasses, your heavenly Father will also forgive you" (Matt. 6:14). Sirach advises, "Forgive your neighbor the wrong he has done, and then your sins will be pardoned when you pray" (28:2). The Lord's Prayer, which includes this thought, has been prayed for centuries.

Paul wrote in Romans, "Weep with those who weep" (12:15). It is written in Sirach, "Do not fail those who weep, but mourn with those who mourn" (7:34).

Alot of the Proverbs were borrowed from philosophy of the day as well, this is not uncommon. But it does not take away from the divine inspiration fo the scriptures.

I have heard several protestant buds of mine say that one of the reasons Luther kicked out the book of Sirach during his reformation was that Jesus never quoted from it, which is wrong. By that standard, the Song of Solomon (Song of Songs) would have to be kicked out also...