Grace alone. Say that. No works are necessary.
I believe Jesus and his associates have already answered that question. They say it better than we can..
Matt. 7: 16 Ye shall know them by their fruits.
Matt. 13: 23 received seed into the good ground . . . beareth fruit.
Matt. 16: 27 (1 Cor. 3: 8;) shall reward every man according to his works.
Acts 10: 35 he that . . . worketh righteousness, is accepted with him.
Rom. 2: 13 doers of the law shall be justified.
2 Cor. 5: 10 receive . . . according to that he hath done.
Gal. 6: 4 let every man prove his own work.
Gal. 6: 7 whatsoever a man soweth, that shall he also reap.
Eph. 2: 10 created in Christ Jesus unto good works.
Eph. 5: 9 fruit of the Spirit is in all goodness.
2 Tim. 3: 17 perfect, throughly furnished unto all good works.
Titus 3: 8 be careful to maintain good works.
Heb. 13: 21 Make you perfect in every good work to do his will.
James 1: 22 be ye doers of the word, and not hearers only.
James 1: 27 Pure religion . . . is this, To visit the fatherless.
James 2: 22 by works was faith made perfect.
James 2: 26 faith without works is dead.
James 4: 17 him that knoweth to do good, and doeth it not.
1 Pet. 1: 17 (Rev. 20: 12-13;) Father . . . judgeth according to every man’s work.
1 Pet. 2: 12 your good works . . . glorify God.
2 Pet. 1: 5 add to your faith virtue.
1 Jn. 3: 18 let us not love in word . . . but in deed.
1 Jn. 3: 22 we receive of him, because we keep his commandments.
Rev. 22: 14 blessed are they that do his commandments.