Here is now a no nonsense approach of Desanctis regarding his conversion... but as you read, do note that he held the position Emeritus Censor, and was professor of theology at the Theological Academy in Rome.
Perhaps it will be asked on what account I have left a position so good, a career which could open up the way for me to the first ecclesiastical dignities, in orer to throw my self to the arms of a troublesome and uncertain future. I have never been pleased with stories which have been written about conversions, because they are mainly a panegyric which the converted one writes of himself; and strong on this opinion I shall not write the story of my conversion, only I shall say to him who will believe it, that the motives that have moved me to abandon Rome, and take refuge in a strange land [he ran to Malta] under the care of Providence, spring from preferring the Glory that comes from God to that which come from men; heavnly benefits to earthly blessings; true peace of conscience , which is only found in Christ, to the false peace the world gives
This is the secret of my conversion, and as for those who will not believe it, I await them before the tribunal of Christ, when all the secrets of hearts shall be manifested, and there they will see if I have lied. .
I offer this observation unlike those in EWTN who seem to come out saying "Eureka - I am so happy I found and now I belong to the TRUE Church", this fellow points to the peace found in Christ. The conversion testimony does not glorify any church body, though it would be obvious that Desanctis aligned with the Waldensians of Italy, I guess my point is that he got converted to Christ who alone gave him peace of conscience. This was somewhat similar to Luther's conversion to the Gospel as well as that of Calvin.