When we pray the “Our Father”, we pray as Jesus prayed. It is the prayer that Jesus prayed, and He taught it to us; when the disciples said to Him: “Master, teach us to pray as you pray.” And this is how Jesus prayed. It is so beautiful to pray like Jesus! Formed by his divine teaching, we dare to turn to God calling him “Father”, because we are reborn as his children through water and the Holy Spirit (cf. Eph 1:5).
No one, truly, could call him “Abbà” — “Father” — in a familiar way without having been created by God, without the inspiration of the Holy Spirit, as Saint Paul teaches (cf. Rom 8:15).
We must consider: no one can call him “Father” without the inspiration of the Spirit.

– Pope Francis