What redeems it is the idea only.
1	What	what	PRON	WH	PronType=Int	2	nsubj	_	_
2	redeems	redeem	VERB	PRES	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	6	csubj	_	_
3	it	it	PRON	PERS-SG	_	2	obj	_	_
4	is	be	AUX	PRES	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	6	cop	_	_
5	the	the	DET	DEF	Definite=Def|PronType=Art	6	det	_	_
6	idea	idea	NOUN	SG-NOM	Number=Sing	0	root	_	_
7	only	only	ADV	_	_	6	advmod	_	SpaceAfter=No
8	.	.	PUNCT	Period	_	6	punct	_	_
