If we're not verbalizing the Gospel, then we are to live it for all to see its fruit. Our perfect example of this is Jesus. Since every believer's life is different, every ministry is, too!
The greatest seed we can ever sow is the Gospel. This seed is the very expression of God’s love, and therefore, when sown righteously, an expression of our own love (Jn 3:16; Eph 5:25-27; 1Jn 4:19).