All 4 Uses of

manifold
in
New Testament

18:29 And he said unto them, Verily I say unto you, There is no man that hath left house, or parents, or brethren, or wife, or children, for the kingdom of God's sake, 18:30 Who shall not receive manifold more in this present time, and in the world to come life everlasting.†
Book 3. *

manifold = many and varied

3:8 Unto me, who am less than the least of all saints, is this grace given, that I should preach among the Gentiles the unsearchable riches of Christ; 3:9 And to make all men see what is the fellowship of the mystery, which from the beginning of the world hath been hid in God, who created all things by Jesus Christ: 3:10 To the intent that now unto the principalities and powers in heavenly places might be known by the church the manifold wisdom of God, 3:11 According to the eternal purpose which he purposed in Christ Jesus our Lord: 3:12 In whom we have boldness and access with confidence by the faith of him.†
Book 10.

1:6 Wherein ye greatly rejoice, though now for a season, if need be, ye are in heaviness through manifold temptations: 1:7 That the trial of your faith, being much more precious than of gold that perisheth, though it be tried with fire, might be found unto praise and honour and glory at the appearing of Jesus Christ: 1:8 Whom having not seen, ye love; in whom, though now ye see him not, yet believing, ye rejoice with joy unspeakable and full of glory: 1:9 Receiving the end of your faith, even the salvation of your souls.†
Book 21.

4:10 As every man hath received the gift, even so minister the same one to another, as good stewards of the manifold grace of God.†
Book 21.

Definitions:

(1) (manifold as in: reasons are manifold)
many and varied
(2) (meaning too rare to warrant focus)
meaning too rare to warrant focus:

Manifold can also be used as a noun to refer to a pipe that has several lateral outlets to or from other pipes; such as "the intake manifold of an engine." A comprehensive dictionary will contain other, more specialized, meanings.