Is the Bible enough, or do we need church tradition too?

¹⁹And when they shall say unto you, Seek unto them that have familiar spirits, and unto wizards that peep, and that mutter: should not a people seek unto their God? for the living to the dead? ²⁰To the law and to the testimony: if they speak not according to this word, it is because there is no light in them.

⁵Then the Pharisees and scribes asked him, Why walk not thy disciples according to the tradition of the elders, but eat bread with unwashen hands? ⁶He answered and said unto them, Well hath Esaias prophesied of you hypocrites, as it is written, This people honoureth me with their lips, but their heart is far from me. ⁷Howbeit in vain do they worship me, teaching for doctrines the commandments of men. ⁸For laying aside the commandment of God, ye hold the tradition of men, as the washing of pots and cups: and many other such like things ye do. ⁹And he said unto them, Full well ye reject the commandment of God, that ye may keep your own tradition. ¹⁰For Moses said, Honour thy father and thy mother; and, Whoso curseth father or mother, let him die the death: ¹¹But ye say, If a man shall say to his father or mother, It is Corban, that is to say, a gift, by whatsoever thou mightest be profited by me; he shall be free. ¹²And ye suffer him no more to do ought for his father or his mother; ¹³Making the word of God of none effect through your tradition, which ye have delivered: and many such like things do ye.

¹⁰And the brethren immediately sent away Paul and Silas by night unto Berea: who coming thither went into the synagogue of the Jews. ¹¹These were more noble than those in Thessalonica, in that they received the word with all readiness of mind, and searched the scriptures daily, whether those things were so. ¹²Therefore many of them believed; also of honourable women which were Greeks, and of men, not a few.