The Divine Mentor (the Holy Spirit), Jesus promised to the disciples before His departure. He introduced the "living water" in Joh 7:37-39. The Spirit worked with old testament saints (Zec 4:6, Joe 2:28) but now works in us. This was anticipated in the Old Testament (Isa 12:3, Isa 43:20, Isa 44:3, Isa 55:1). Joh 13:10-15 has the Spirit pre-figured in the cleansing water Jesus washes their feet (1Jo 1:9). Jesus' command in Joh 13:34-35 "love one another" is impossible without the Spirit (Rom 5:1-5, Gal 5:22-23, 1Co 13:1-13). In Joh 14:12-17 the Spirit is the "Paraklete"("called along side") -- the Helper. His character as Mentor: mother comfort (1Th 2:7); father as teacher of children (1Th 2:11); coach urging an athlete (2Ti 2:1); commander urging soldiers in battle (2Ti 2:3). Spirit is Truth (Joh 13:25-27) is involved in our recall -- He guards and gives peace (Phi 4:6-7). Joh 15:1-7 says the Spirit is the "fruit-bearer". Joh 15:26-27 says the Spirit is "witness" (Act 1:8). Joh 16:5-11 says the Spirit is conviction -- convicing men. Joh 16:12-15 says the Spirit is guidance (1Ki 19:1-13). He'll keep us from deception (Luk 21:8), deliver us from fear (Luk 21:9), provide us a witness (Luk 21:13), give us endurance (Luk 21:19), guide us where we need to be (Luk 21:21), give us joyous expectation (Luk 21:28), warn us of danger to our heart (Luk 21:34), and give us a watchfulness (Luk 21:36).
The Divine Mentor is God the Holy Spirit. God answered Jesus' prayer to provide us the Spirit not just to be with us but in us -- to pray with us labor with us to guide us teach us and equip us -- the goal being that we'd be prepared for the troubled times in which we live.